How to Restore a Rusty Cast Iron Skillet (2023)

If you have a rusty piece of cast iron cookware that needs a fix, then don’t throw it out, bring it back to life! Learn how to restore a rusty cast iron skillet with a potato, some salt, and your self-cleaning oven!

It amazes me every year how many cast iron items are thrown away or sold at yard sales for just a couple bucks. Yes, maybe I can understand just trashing an old rusty cheap-o piece of no-name cast iron… but discarding a Griswold cast iron skillet because it looks rusted beyond repair just hurts my heart.

Cast iron cookware can last from generation to generation… and, in fact, that’s one of the major selling points of cast iron. I know because I live in East TN, and I’ve visited the Lodge Factory Store many times! “You can pass this on to your grandkids”, they say.

But at the first sign of rust, most people could care less about trying to restore their pans and instead just chuck ’em. Maybe it’s because they think that their rusty cast iron is beyond repair or because they just don’t want to invest the time to do it themselves. Admittedly, when I spent 3 hours grinding down a $3o Lodge pan with my Dremel a few years ago, I thought it would have been much easier to just buy a new one. They say hindsight is 20/20, and if I knew about this easy method for restoring cast iron pans back then, it would have saved me a lot of time and effort.

But back to this rusty Griswold…

When a friend gave me an old Griswold #8 cast iron skillet recently, I knew that no amount of rust could stop me from restoring that bad boy to its glory days… which happened to be in the 1930’s! And if I was going to sit on my front porch for 3 hours and nurse a Lodge skillet back to health, then you better believe that I was going to find a way to restore this rusty old Griswold.

And after just a few hours and a little elbow grease, I’m pretty proud of the results:

How to Restore a Rusty Cast Iron Skillet (1)

*Right side is BEFORE, Left side is AFTER… Not bad for a pan that’s almost 100 years old, eh?!

If you’ve got a treasured family heirloom or just a regular old cast iron piece that’s “eaten up” with rust like mine, then here’s how to restore a rusty cast iron skillet…

Supplies Needed to Restore Cast Iron Cookware

  • 1 baking potato
  • coarse salt
  • rock salt
  • stainless steel wool or other coarse scrubbing pad
  • oil – I’ll tell you about my favorite oils to use on cast iron pans down below
  • paper towels

To restore a rusty cast iron skillet, you’ll also need an oven, patience and some extra time… While this is an incredibly easy method to fix rusted cast iron, it does take some TIME! However, I have used this restoration method many times and I’ve always been happy with the results.

*Warning: If your cast iron is super old or thin, you may want to use a different method. The pictures in this post are from a 1930’s Griswold… so keep in mind, I was working with a 100 year old pan. Other cast iron restoration methods include a lye bath, electrolysis, and Carbon-Off, but like I said I have been very happy with this potato and salt method.

(Video) How to Season a Rusty Cast Iron Skillet | How to Fix, Clean and Restore Cast Iron

*One last side note…. Just because your cast iron has some rust DOSE NOT mean you have to do the oven step of this process. Putting your pan in the oven on self-cleaning mode completely strips your cast iron down to bare iron, and it takes some time to rebuild your seasoning. If you only have a little build up and spotty rust, then just try the potato and salt scrub first. All temps and times are what worked for me, but they may not necessarily work for you, based on the condition of your pan, the settings of your oven, etc.

The reason why I used the combination of the potato, salt, and self-cleaning oven methods is because my pan had deep-pitted rust AND carbon buildup.

How to Restore a Cast Iron Skillet

Step 1: Cut a raw baking potato in half.

What does restoring a cast iron skillet have to do with baking potatoes? Some people say there is a special rust-removing natural chemical in potatoes, and others say that it’s a bunch of jibberish and not to waste a good potato. I’m not a scientist and I don’t know anything about the chemical make-up of a potato, but what I DO KNOW is that this method has worked wonders for me. The potato adds just the right amount of moisture to make an effective paste, and the SALT is the star of the show here.

But as with anything, I encourage you to try out different methods to see what works best for you.

Step 2: Add about 1/2 cup of rock salt and 1/2 cup of coarse table salt to your rusty cast iron skillet.

*If you don’t have rock salt just use all coarse salt. It just breaks down faster than rock salt, so you might have to add more if needed.

Just pour the salt into the bottom of your rusty pan like this:

How to Restore a Rusty Cast Iron Skillet (2)

Step 3: Use the cut potato to scrub the salt all around the rusty cast iron skillet.

Yes, you’re going to use the potato as a scrubbing pad of sorts… Just take the potato, cut side down in the salted pan, and scrub like mad. The natural moisture will come out of the potato and be just enough so that you don’t have to add water. And when the moisture from the potato combines with the salt, you’ll have a really effective abrasion paste.

How to Restore a Rusty Cast Iron Skillet (3)

You should notice the rust coming off of your cast iron skillet immediately. When your “paste” starts turning a brown/rust color, then you know you’re on the right track. Keep scrubbing. If the outside and underneath of your cast iron pan is rusted too, then treat it just like the inside. The idea is to get all the rust off in this stage.

Your potato will probably look something like this:

How to Restore a Rusty Cast Iron Skillet (4)
(Video) The Easy Guide On Seasoning and Restoring Cast Iron

Gross, I know… but this method for getting rust off a cast iron pan is VERY effective!

Step 4: Rinse your pan with warm water and repeat the salt scrubbing as needed.

Now you have two options depending on the severity of the rust. Either rinse your pan out and start the process again (if your rusty cast iron pan was SUPER bad!), or you can just rinse the pan and move on to the next step if you feel like the first salt rubbing was enough. The main purpose of rinsing your pan now is to be able to see more clearly if you removed all the rust. You will need to get all of the brown sludge out to see if you need to repeat the salt scrubbing process.

How to Restore a Rusty Cast Iron Skillet (5)

As you can see, my Griswold #8 cast iron skillet was VERY rusty, so I had to do the salt scrubbing process twice. I just rinsed my pan under warm water, dried it with a towel, and then dumped the salt in it again.

Step 5: Wash your refurbished cast iron skillet with warm soapy water.

Once you think you have all the rust off, go ahead and wash your cast iron skillet with good ole soapy water. Yep…regardless of what you’ve heard before about NEVER using soap on cast iron, DO NOT BELIEVE IT. Heck, even the instructions on a new Lodge say use soap if needed…

How to Restore a Rusty Cast Iron Skillet (6)

Once again, the debate over whether or not to use soap on cast iron is another story entirely, so I’ll save that for another post… coming soon!

*Note – If your pan only had a small amount of rust to start with, then this would be a good place to stop. You probably won’t need to put it in the oven.

Step 6: Place your restored cast iron skillet upside down in your oven, and set the oven to “Clean”.

If you have two oven racks, then it’s best to adjust one rack to the middle and one right underneath it. Then, place your cast iron skillet on the middle rack, with it turned upside down, and place either a sheet pan or a large sheet of aluminum foil on the second rack, directly underneath your pan, like this:

How to Restore a Rusty Cast Iron Skillet (7)

If you only have one oven rack, don’t panic! You can still use this method for how to restore a rusty cast iron skillet. Just put your rack in the middle of your oven, and set your pan directly on top of a piece of aluminum foil or a sheet pan.

Then turn your oven on “Clean” mode and let it do the work for you! Here are some questions you may have about this process:

(Video) Rusty Cast Iron Skillet Restoration

How long should I leave my cast iron skillet to bake in the oven on “Clean” mode?

My oven (a Frigidaire Gallery electric glass top) has two options: a 2 hour clean and a 3 hour clean. I used the 2 hour self-cleaning mode and it worked perfectly!

What if my oven doesn’t have a self-cleaning mode? Can I still use it to restore my rusty cast iron pan?

No. The self-cleaning mode on a standard oven reaches an average of 850 degrees or higher which burns the carbon and seasoning off of your damaged pan and strips it down to bare metal. If you don’t have a self-cleaning oven, you should try a different restoration method.

Step 7: Let your pan cool, and then brush off any residue.

After your pan has gone through a full 2 hour cycle in the oven, let it cool before trying to move on to the next step. Then, you’re just going to use a stainless steel wool to knock all that crud off your pan.

You may be cussing me at this point, because it probably looks like your pan is damaged, but it’s not! This is how your pan should look after coming out of the oven. The black part is the oil over time turning black (or the patina), and the new silver color you see is actually the original color of iron before the company’s season process.

How to Restore a Rusty Cast Iron Skillet (8)

Just use your steel wool to brush off the “rust dust” and move on to the next step.

Step 8: Wash and dry your newly restored cast iron skillet!

Don’t worry, the finish line is near! Your pan should be looking good as new now… minus a few good coats of seasoning, which is coming up next. But first, after you’ve brushed off all the dried rust dust, give your pan a good thorough wash and dry.

How to Season a Restored Cast Iron Skillet

Now that you know how to restore a rusty cast iron skillet, it’s time for the seasoning process… and it’s important to remember that this takes some patience, too! After all, you’re doing a completely NEW seasoning on a BARE pan.

Here’s how I seasoned my restored skillet:

  • Preheat oven to 500 degrees.
  • Be sure that your cast iron skillet is completely dry, and place it on the stove on medium heat.
  • Allow your cast iron skillet to heat up on the stove for approximately 5-8 minutes. This allows the pores in the metal to open so that the oil soaks in.
  • Add about 2 tablespoons of a high heat oil (Crisco and avocado oil are my go-to’s) and spread it around the pan with a paper towel. Be sure to get every nook and cranny with a thin coat of oil… including the outside of the pan and the handle. TIPKeep this paper towel, because it absorbs the excess oil, and eventually you can just use the towel for a thin layer of oil instead of always adding more oil to the pan.
  • Next, grab a CLEAN paper towel and wipe up any excess oil. Remember, this is a multi-step seasoning which is important because it allows the seasoning to cure and develop a patina. You will notice that as you add additional coats of oil, that the pan will need less and less. That means you’re heading in the right direction.
  • After you’ve wiped out an extra oil, place your cast iron pan in the oven just like before… upside down and with something underneath it to catch any oil that melts or burns. If you’ve applied the correct amount of oil, you shouldn’t really have any leak out of your pan.
  • Bake for 1 hour at 500 degrees and then allow it to cool down completely in the oven.

*SIDE NOTE – If I could give you ONE tip about how to restore a rusty cast iron skillet, it would be that LESS IS MORE! If you add too much oil and don’t wipe enough off, then you’ll have a sticky residue on your pan after it comes out of the oven. This residue is a pain to get off, and it really stalls the process… Just another reason to take your time and only add thin layers of oil.

I repeated this whole seasoning process 3 to 4 times… so after your pan is cool, put it back on the stove and start again by adding oil with your paper towel.

Here’s the finished product… pretty dang good, huh?!

(Video) Rusted Cast Iron Skillet Restoration.

How to Restore a Rusty Cast Iron Skillet (9)

Now comes the “egg test”…

Testing Your Newly Restored Cast Iron Skillet

Now that your rusty cast iron skillet is cleaned up and looking good as new, it’s time to test out the seasoning. And my favorite way to test out a newly seasoned cast iron skillet is to cook a fried egg in it.

Now don’t be alarmed if your very first egg sticks to the pan… the same thing happened to me. In fact, EVERY TIME that I strip down a pan to bare iron and then re-season it, the first egg sticks.

Here’s what to do if your egg DOES stick to the pan:

  • Over-cook the egg.
  • Scrape the egg off the bottom of the pan with something flat like a square-head wooden spatula. Be careful not to dig into your new seasoning.
  • If the egg is still stuck after scraping, then you can rinse your pan with HOT water, but only rinse as a last resort. If you DO have to rinse your pan, DO NOT ADD SOAP. This is one of the very few times you will hear me say not to use soap on cast iron. That’s because your seasoning is pretty new, and you don’t want to damage it with soap.
  • If you need to rinse the pan, then allow it to dry completely.
  • Apply another thin layer of butter and/or avocado oil with your paper towel, and try another egg.

You can also test your seasoning by cooking scrambled eggs, because they typically take up more surface area in the pan than a fried egg, which allows you to see more sticky spots on the pan’s surface. Scrambled eggs really coat the whole pan and get deep down in the metal which helps the seasoning also.

By the time I got to egg #3 (3rd time’s the charm!), my seasoning was perfect and that egg looked like it was sliding around on glass… not bad considering I had just taken the skillet down to bare iron and brought it back from the dead!

What to Cook First in Your Restored Cast Iron

Once your cast iron is seasoned, it’s really important to use it the right way for the next few cooks. You want to avoid cooking acidic foods until you are confident that your pan is “all the way seasoned”. Stay away from tomato sauce, citrus, etc. These acidic foods break down the oil in your seasoned cast iron pan.

Here are some GOOD things to cook in your newly restored cast iron skillet:

  • ground beef
  • steak – Check out this post on How to Cook Filet in a Cast Iron Skillet
  • sausage
  • bacon
  • sautéed vegetables
  • hamburgers
  • chicken
  • fried anything – fried fish, country fried steak, etc.
  • grilled cheese
  • quesadillas

Sautéing veggies in that avocado oil is great for your pan. Browning any meat is great. Deep frying is great.

Any time you can cook with a larger amount of fat and a higher than normal temp, you are going to help really speed up the seasoning process.

And now my rusty old (and I mean 100 years OLD!) Griswold cast iron skillet has a new life… My daughter is almost 11 and I’ve just started teaching her how to make her own scrambled eggs using that pan. She’s already calling it “her pan”, so I guess the “cast iron people” were right… these pans CAN be passed down from generation to generation.

(Video) How to Restore, Season and Clean a Cast Iron Skillet

Thanks for reading guys! If you have any questions about how to restore a rusty cast iron skillet, drop them in the comments below and I’ll do my best to help you out!


How do you rejuvenate a cast iron skillet? ›

How to Restore Cast Iron
  1. Place pan upside-down in sink and sprinkle with baking soda. ...
  2. Add a few squirts of dishwashing liquid. ...
  3. Use a scrub brush to remove rust and debris. ...
  4. Turn pan over a clean using more baking soda and a scrub pad. ...
  5. Rinse and dry thoroughly.
May 1, 2020

What's the easiest way to remove rust from cast iron? ›

Use an abrasive scrub pad.

Abrasive scouring pads will remove the surface of a seasoned pan, but when cast-iron rust is allowed to build up, it takes a rough scrubber to remove it. Try using a wire brush or a steel wool pad. Add a little hot water to help the process along.

What if I can't get all the rust off my cast iron skillet? ›

The easiest way to remove rust from cast iron is to soak the pan in a 1:1 vinegar and water solution. Then scrub the rust off with a scrubby sponge, scrub brush, or steel wool.

Can I use steel wool on cast iron? ›

Can I use steel wool or a metal scrubber to clean my cast iron pan? No! We recommend using a pan scraper or the Lodge Chainmail Scrubber to remove any stuck-on residue.

Does vinegar remove rust from cast iron? ›

Mix together equal parts basic white vinegar and water, and either add the solution to the pan if it's rusty only on the inside or completely submerge the pan in a bucket of the stuff to dissolve the rust all over. Letting it soak for about an hour should do the trick, depending on the damage.

Can badly rusted cast iron Be Saved? ›

Regardless of the extent of rust, there are options beyond throwing out rusted cast iron. For severe rust that covers most of the cookware surface, take the piece to a machine shop to have it sandblasted and restored to raw cast iron, then season immediately.

Does WD-40 Remove rust cast iron? ›

WD-40 Specialist® Rust Remover Soak quickly dissolves rust and restores tools, equipment, and surfaces to bare metal without chipping, scraping or scrubbing. Great for removing rust from tools, metal, cast iron, chrome parts, and more without harming paint, gaskets, trim, or other surrounding parts.

Does vinegar and baking soda remove rust from cast iron? ›

Baking soda is one way of cleaning cast iron pans, but it's not advised to remove rust with vinegar and baking soda together. In fact, baking soda is best used to remove stubborn food stains or black residue, rather than rust.

Can you cook in a slightly rusty cast-iron skillet? ›

It's important to note that you shouldn't use your skillet while it still has rust on it. (This might seem obvious, but for people who haven't used cast iron cookware before, this can be an unfamiliar issue!)

Can you permanently damage cast-iron skillet? ›

3 | Don't overheat your cast iron.

Sticking your skillet into a roaring fire might seem like a good way to heat it up in a hurry, but overheating or uneven heating can cause your skillet to take on a permanent warp, or even crack.

Will rust burn off of cast iron? ›

Place the cast iron in the middle rack of a conventional oven with a baking sheet underneath. Set the oven to the self-clean cycle. This will burn off all the old seasoning and build up and leave you with a bare piece of cast iron.

Does baking soda remove rust from cast iron? ›

For mild rust, try scrubbing with baking soda.

Stir the baking soda with the water to make a rough paste, then use a rag to scrub the paste into the rusty spots of the pan. Once you've scrubbed the rusty areas, let the paste sit for a few minutes, then rinse it off with tap water.

What is the best oil to season cast iron? ›

All cooking oils and fats can be used for seasoning cast iron, but based on availability, affordability, effectiveness, and having a high smoke point, Lodge recommends vegetable oil, melted shortening, or canola oil, like our Seasoning Spray.

Can you use SOS pad on cast iron skillet? ›

Here's another kitchen no-no: Don't use steel wool cleaning pads on your cast iron cookware. If you use cast iron a lot, you probably know how important its protective seasoning is, and so does John Bedford, founder and editor of Viva Flavor, a food company that also specializes in cookware maintenance.

Can Brillo be used on cast iron? ›

How to Clean Cast Iron. Follow these easy steps if your skillet has any rust spots or if it's completely coated in rust. Scrub with hot water using a nonabrasive scour pad with coarse salt or a brillo pad on all sides of the skillet until all of the rust spots are gone.

What should you not put in cast iron? ›

5 foods you should never cook in a cast iron skillet
  1. Tomatoes.
  2. All other highly acidic foods.
  3. Eggs.
  4. Delicate Fish.
  5. Sticky Desserts (Unless your pan is very well-seasoned)
Aug 17, 2021

What happens if you leave cast iron in vinegar for too long? ›

Keep checking it, because leaving the pan in vinegar too long—once the rust has been loosened—will start to damage the cast iron itself. Once the soak is complete, gently scrub the rust away from the cast iron pan with your scrubber.

Can I use bar keepers friend on cast iron? ›

The simplest way to remove a lot of rust from cast iron is to make a slurry of Bar Keepers Friend and a couple of tablespoons of water in the pan and scrub the rust off using a stainless steel scrubber. We recommend wearing rubber gloves. Again, wash, dry, and re-season your pan afterward.

Can I use Epsom salt to clean cast iron? ›

It Makes a Great Cleaner

You can also use it to scrub skillets and pans. Just make sure you don't use it on non-stick pans since it can damage the non-stick finish, which can be dangerous for your health. Use it on cast iron and other pans mixed with soap. It's a great way to remove stubborn stuck on bits.

Does vinegar damage cast iron? ›

Don't fill your cast-iron cookware with wine or vinegar. A splash for sauce or deglazing is OK, but tossing a significant amount straight into the pan undiluted will ruin your cookware, and your health.

Can you get sick from a rusty cast iron skillet? ›

According to the U.S. Environmental Protection Agency (EPA), ingesting rust in small amounts will not harm your health (unless you have a rare disease called hemochromatosis, which causes your internal organs to retain iron).

Does Coca Cola remove rust? ›

Coca-Cola is carbonated, which allows it to dissolve with metal oxides and break up rust on a variety of metals and alloys. Phosphoric acid also gives it rust-busting power, while citric acid makes it an effective stain remover.

Can you use Dawn to clean cast iron pan? ›

Will soap ruin cast iron? Using soap will not ruin your pan. It is totally fine on enameled cast iron, and on plain cast iron, too. It's not going to destroy your seasoning.

Can you get iron from eating out of a cast iron skillet? ›

Cast iron pans can leach a sizeable amount of iron into your food, exceeding dietary intake in some cases. Acidic foods will contribute to much more leaching while an old, heavily-seasoned pan will leach much less iron than a newer one.

Why is my cast iron rusting after first use? ›

The Cause: Rust forms when the cookware is exposed to moisture for extended periods of time and is not harmful in any way. If cast iron is left in the sink to soak, put in the dishwasher, or allowed to air dry, it will rust.

When should you throw away a cast iron skillet? ›

If a crack appears in your cast iron pan, it's time to ditch it. Even a hairline crack will expand and contract when heated and cooled, and ultimately the pan will split—a potentially dangerous situation if it happens during cooking! Plus, cracks are difficult to clean and may harbor bacteria and rust.

When I wipe my cast iron pan it's black? ›

They are most likely carbon deposits. This happens due to overheating of fats and oils. Using an oil with a low smoke point will carbonize at high temperatures and cause residue from the pores of your pan to rub off onto your food.

How long should you leave baking soda on rust? ›

To use this method, simply mix enough water into baking soda until you are able to form a thick paste. Use your hand or a toothbrush to spread the paste all over the metal, making sure that rusty spots are well covered. Let the paste sit on the object for an hour or so.

What dissolves iron rust? ›

Strong acids will dissolve rust, but they will also dissolve paint, finishes, and sometimes even the metal itself. Hydrochloric acid (which is also called muriatic acid in its diluted form), as well as phosphoric acid and sulfuric acid may be used in rust removal formulas using strong acids.

How does salt remove rust from cast iron? ›

How do you clean a cast iron skillet with salt?
  1. Pour 2 to 3 tablespoons of coarse kosher salt into your cast iron skillet. ...
  2. Using a clean kitchen rag or a folded paper towel, gently move the salt around your pan, scouring the surface. ...
  3. Dry your pan with a rag or paper towel, and then place it on the stovetop.

What oil should you not use on a cast iron skillet? ›

These are all fats with high smoke points, which means they will bake on cleanly instead of turning sticky. Do not use olive oil or butter to season your cast-iron pan — they're great to cook with, just not for initial seasoning.

Is olive oil good for cast iron? ›

Olive oil is a great option for seasoning your cast iron skillet because it is affordable and easy to find. It also has a high smoke point, which means it can withstand high temperatures without burning.

Is Crisco good for seasoning cast iron? ›

Any cooking fat will work, but some make more sense than others. For example, there's absolutely no reason to waste extra-virgin olive oil or other expensive oils for your cast-iron seasoning. We use Crisco shortening because it's inexpensive and easy to apply.

Can old cast iron be restored? ›

Cast-iron skillets are naturally prone to rust. But even if it has turned bright orange, the pot absolutely can be fixed. (Even if you snag an old, rusty skillet at the flea market, that orange will come off!) It only takes a few simple steps to have your rusted cast iron looking brand-new.

What is the best oil to season a cast iron skillet? ›

All cooking oils and fats can be used for seasoning cast iron, but based on availability, affordability, effectiveness, and having a high smoke point, Lodge recommends vegetable oil, melted shortening, or canola oil, like our Seasoning Spray.

How do you get seasoning back on cast iron? ›

If the seasoning in your pan is sticky, this is a sign of excess oil built up on the cookware. The Fix: To remedy stickiness, place the cookware upside down on the top rack of the oven and bake at 450-500 degrees F for one hour. Allow to cool and repeat if necessary.

Can you ruin a cast iron skillet? ›

If a crack appears in your cast iron pan, it's time to ditch it. Even a hairline crack will expand and contract when heated and cooled, and ultimately the pan will split—a potentially dangerous situation if it happens during cooking! Plus, cracks are difficult to clean and may harbor bacteria and rust.

How long do you soak cast iron in vinegar? ›

Soak your rusty cast iron skillet. Place your cast iron cooking implements in the vinegar mix, so they are totally covered. Leave to soak for up to 8 hours. It's important to remember that rust might come away before the eight-hour period is over, so it's important to check the skillet every half hour.

What is the lifespan of cast iron? ›

That's not necessarily bad news for property owners; cast iron is capable of withstanding high water pressure, and properly installed cast iron lines can easily last for 80 to 100 years. Unfortunately, corrosion can severely limit service life.

Does Coke remove rust from cast iron? ›

Coke has phosphoric acid, which is a compound that can remove rust. Phosphoric acid is what gives coke its flavor (that I know you love). Nonetheless, it is also what makes it more acidic than any other acids, like vinegar. Coke is a good way to clean cast iron and remove rust from it because it is inexpensive.

What is the biggest problem with cast iron? ›

But cast iron isn't actually a very good heat conductor, so it's prone to developing hot-spots and cold-spots. Not good if you want even cooking. And since carbon steel is thinner, it's even more prone to uneven heating.

What should you not do to a cast iron pan? ›

6 Things I Never Do to My Cast Iron Skillet
  1. Avoid cooking in it. Cast iron cookware improves with use. ...
  2. Let it soak in the sink. “Avoid cooking acidic food in your cast iron” is a bad rumor that many cooks have heard. ...
  3. Scrub it with a scouring pad. ...
  4. Store it in the oven. ...
  5. Store it completely empty. ...
  6. Baby it.
Oct 2, 2016

Why shouldn't you cook tomatoes in cast iron? ›

Anyone who's ever eaten a tomato or cooked with tomatoes can verify that this fruit is quite acidic. As it happens, the tomato's acidity is precisely why doesn't work well with cast-iron cookware, especially for long cooking stretches. "Cast-iron skillets can handle a small amount of acidic fruit at a time.


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