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How to Season or Re-Season a Cast Iron Skillet

Jan has been cooking and writing about food for over 20 years. She has cooked on multiple television stations, including the Food Network.

How to season, re-season, clean, and cook with cast iron cookware.

How to season, re-season, clean, and cook with cast iron cookware.

Caring for Cast Iron

A cast iron skillet is one of the most versatile tools you can have in the kitchen. If you take care of it properly, it will last a lot longer than you will. And, unlike you or me, it will achieve a nearly perfect non-stick surface. Want the crispiest fried chicken ever? A gorgeous, crackly cornbread crust? Even temperatures for deep frying? The perfect sear on a steak? Then cast iron is your friend.

There are some rules, though. Cast iron doesn't like three things: high-acid foods (like citrus or vinegar), soap, or water. And even old, well-seasoned pots and pans will need to be re-seasoned over the years to maintain their luster. Keep these things in mind and you'll have some of the best cookware in the world.

A perfectly seasoned cast iron pan. Oooo—a thing of beauty and wonder!

A perfectly seasoned cast iron pan. Oooo—a thing of beauty and wonder!

How to Rescue a Rusty Cast Iron Pan

Sometimes, you might abuse or neglect your cast iron cookware. Other times, you might find an old rusty skillet or other piece of cookware that wasn't cared for correctly. These rescue pieces can be hidden gold, but you have to know how to bring them back to their glory. I had one recently that was brought to me for medical attention. Here's how I nursed it back to glory.

Note: You can do the same for a new skillet; you just will be removing the protective coating the manufacturer applies to protect a 'pre-seasoned' skillet from oxidizing if it comes into contact with moisture.

This is how much cast iron hates water: I was interrupted, so I left the wet pan on the counter for about an hour to do something else. When I came back, the rust had already appeared.

This is how much cast iron hates water: I was interrupted, so I left the wet pan on the counter for about an hour to do something else. When I came back, the rust had already appeared.

The rusty cast iron skillet before triage.

The rusty cast iron skillet before triage.

How to Re-Season Cast Iron

The photo above shows what an abused piece of cast iron looks like. It was rusty, and there were lots of places where the carbon seasoning had cracked and was actually flaking off. Since I didn't want carbon dust in my food, I had to do something. All you will need is some steel wool, paper towels or rags, your oven, and some cooking oil.

  1. Clean it thoroughly with warm, soapy water. (Note: This is one of the only times you should ever use soap on your cast iron pan!)
  2. Next, you'll want to break out the steel wool. There's really only one way to do this: Scrub it to get off the grime. Normally, steel wool is the enemy of cast iron because it does so much damage to a seasoned surface. But that's what you want here: Scrub until clean.
  3. Next, grab some paper towels or rags and keep rubbing. If you have an old skillet, the Lord only knows what all you're wiping off at this point.
  4. Note: Some people scrub the outer surface of the pan as well—the part that comes into contact with the burner—which looks nice but isn't necessary.
  5. Once you're down past all the rust and carbon gunk (yes, gunk is a technical term), you're ready to treat that old skillet the same way you'd treat a new one: Preheat your oven to 450 to 500°F, break out some paper towels and a little vegetable oil, and you're ready to go.
  6. Cover the entire surface (the inside and outside of the pan) with a thin coating of oil. Not too much or you'll gunk it up again.
  7. Put the pan upside-down in the oven and bake it for an hour at 450 to 500°F.
  8. Remove it from the oven, and once it's cool enough to handle, rub a paper towel or rag across the surface. If it comes away clean, you're done. If you're still pulling off icky stuff, then repeat the rub, oil, and bake process.
  9. Once the towel comes clean, you have a seasoned surface.

How Often Should I Re-Season Cast Iron?

A few times a year, depending on how you use and care for your pan, you may find the need to re-season your cast iron in the oven.

A super-clean, just-scrubbed skillet still releases a LOT of gunk. Keep wiping down with fresh oil and clean paper towels, and you'll get it REALLY clean.

A super-clean, just-scrubbed skillet still releases a LOT of gunk. Keep wiping down with fresh oil and clean paper towels, and you'll get it REALLY clean.

The only thing left on this towel is clean oil - the skillet is now truly clean.

The only thing left on this towel is clean oil - the skillet is now truly clean.

How to Season Cast Iron

Before you use a brand new cast iron pan, if it is not pre-seasoned, you will need to season it first. The method of seasoning a skillet is the same whether you're restoring one or getting a new one ready for cooking.

  1. Preheat your oven to 450 to 500°F.
  2. Pour a little vegetable oil into your skillet and rub it thoroughly around the interior cooking surface and exterior of the pan, too.
  3. After wiping away any excess oil (which could lead to a too-sticky surface) but leaving a thin coating, you're ready for the oven.
  4. Put the skillet in upside-down and bake for an hour at 450 to 500°F.
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Read More From Delishably

What If My Pan Is Sticky After Seasoning?

It's likely that you used a too-thick layer of oil or that your oven wasn't hot enough.

What's the Difference Between Seasoning and Re-Seasoning?

"Seasoning" is just baking oil into cast iron in a process called polymerization. It gives your cast iron that lustrous and shiny black patina and creates a natural nonstick cooking surface that repels rust. The first time you use an unseasoned cast iron pan, you'll want to season it first. From then on, you'll want to re-season it any time carbon or gunk builds up or if you ever see any rust.

What Does "Pre-Seasoned" Mean?

If your skillet came 'pre-seasoned,' it will have a protective coating applied by the manufacturer. Some good companies do the seasoning for you ahead of time and oil and bake their cookware at the foundry. Lodge, for example, has been pre-seasoning all their cookware since 2007. So if you bought a pan that has been officially 'pre-seasoned,' you don't need to season it before first using it (although all cast iron pans will need re-seasoning eventually).

How to Prevent Cast Iron From Rusting

The best way to preserve cast iron is to use it! Every time you cook with oil, you're adding a layer of goodness to your pan. If you're cleaning it properly and avoiding certain ingredients (see list below), then the more you use your cast iron cookware, the better and more non-stick the surface will get. It will eventually look gorgeous, shiny, and black. The more you use it, the more you'll fall in love with it and find you want to care for it—nice how that happens.

Tips for Maintaining Cast Iron Pans

To care for cast iron that has already been 'seasoned' (it already has a black, sort of shiny surface that's nearly non-stick), just do the following:

  1. Don't cook high-acid foods in cast iron. Chicken piccata is best done in a different skillet. You can use small amounts of acids (like wine, lemon, tomato, or orange juice) without a problem, but try to keep acidic ingredients in check when you're using your cast iron.
  2. Wash by hand. Never put cast iron in the dishwasher! To clean it, you can use soap if you must, but mostly you'll just use hot water and a sponge or bristle brush. Use a stiffer brush to remove stuck-on bits. Instead of soap, you can simply rub it with a couple tablespoons of salt. Rinse it well and dry it immediately and thoroughly.
  3. Dry completely and immediately. Remember: Water will rust your cast iron! After washing, heat the pan on the stovetop to get it to dry quickly and fully. While the water is evaporating, use a paper towel to smooth a tiny bit of vegetable oil all over the surface of the pan.
  4. Periodically re-season the surface. On occasion, especially if you use it a lot (or rarely!), rub the interior and exterior of your pan with a thin film of oil, place it upside-down in an oven at 450 to 500°F, and let it sit for an hour.

That's it—give it a little care, and it will give a lot back to you.

Common Questions About Cast Iron Cookware

What kind of oil should I use on cast iron?

When you're cooking, any oil can be used, and the oils of both veggies and meats add layers of luster to your pan. For seasoning, though, vegetable oils set a better and harder finish than animal fats and will also not get rancid, so I use vegetable oil. If you don't have any, canola oil or shortening will do.

Can I use soap to clean my cast iron?

If you really need to, you can use a mild soap to clean cast iron, but soap is usually not necessary and should be avoided. Remember, your cast iron likes to stay a little oily! But when you very rarely need to cut the excess grease, a little soap won't hurt.

Can I clean cast iron with water?

It's fine to rinse your cast iron, as long as you dry it quickly and completely and coat it with a thin layer of oil. Just skip the soap.

Do I need to wash cast iron right away after cooking?

When you don't have time to wash the pan right away, what is best: leaving it dirty or leaving it to soak? You should never leave a cast iron pan to soak. If the food you cooked isn't acidic, it's fine to leave a greasy pan overnight.

Should I clean both the inside and the outside of the cast iron skillet?

It is not necessary to scrub and season the outside of your cast iron cookware since this surface never comes into contact with your food (although many people do because they like the way it looks).

Can you ruin a cast iron pan?

It's very hard to ruin cast iron, but it is possible. Iron is not indestructible. Extreme heat can bend and warp it, and if it's cracked, it can't be saved. It is possible to ruin a cast iron pan with too much rust, but a little rust is not the end of the world; it'll just take a little elbow grease.

What kind of cooktop can I use with my cast iron cookware (gas, electric, induction, etc.)?

You can use cast iron on any type of heat source—flame or electric—except a microwave. It can even be used in the oven or on a camp fire.

Can I use metal utensils with cast iron?

Utensils of any material will work—wood, silicone, or metal.

Do you always have to season a new cast iron pan?

If it was not pre-seasoned at the foundry, all new and unused cast iron cookware should be seasoned before use.

Is it true that I can't cook any acidic foods?

A little lemon juice or tomato sauce isn't going to ruin a well-seasoned pan. Large amounts of acidic foods can thin the seasoning and may hasten the need to re-season, but they won't ruin your pan. In fact, cooking highly acidic foods will increase the amount of iron that leaches from the pan into your food, which can be a good thing.

Is cast iron bad for your health (like teflon)?

Cast iron will not leach dangerous chemicals into your food. It may leach iron, but that's a great thing, especially if you're anemic! Cooking with cast iron can increase the iron content of the food by as much as 20%; acidic foods increase the release of iron.

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