How To Clean And Season A Cast Iron Griddle

Pinterest graphic with text overlay reading "Cast Iron 101"

Whether at a campsite or at home, our cast iron skillet is the first pan we reach for. In this guide, shed some light on this classic piece of camp cookware and show you how to season, cook with, clean, and maintain your cast iron. If properly cared for, cast iron can last for generations.

Cast iron skillets and Dutch oven on a wooden surface

Why we love cast iron cookware

Whether at home or out camping, we love cooking with cast iron. Here are a few of the reasons we like cast iron so much:

↠ Super versatile – you can cook nearly anything with cast iron
↠ It's virtually indestructible and will last for years
↠ Can be placed over an open flame, on a bed of embers, or into the oven at home
↠ Can be heated to extremely high temperatures
↠ Cast iron has great heat retention & radiation
↠ The nonstick seasoning can be endlessly restored

Seasoning: Cast iron's secret sauce

The surface of cast iron cookware is made up of microscopic imperfections. When oils are heated on its surface, they bond to the imperfections and create a smooth plastic-like surface. This chemical reaction is known as polymerization and the non-stick layer that forms is what is commonly referred to as the pan's "seasoning".

This seasoning can be built up or worn down over time. You'll be able to tell if your cast iron is losing its seasoning because the glossy surface will turn matte and food will start stick to the pan.

A few common ways cast iron cookware can lose their seasoning are:

↠ Excessive scouring and/or using really harsh detergents while cleaning
↠ Water corrosion from putting away a pan that's still wet
↠ Cooking highly acidic foods for extended periods of time (the less likely reason)

But thankfully, it's never too late to restore your seasoning! Read on to learn how to season a new pan or restore the seasoning on an older one.

How to season cast iron

Nearly every new cast iron pan you purchase will come "pre-seasoned" from the manufacturer. This is a good base layer to start with, but we always recommend putting on a few more layers of your own for good measure.

If you have an old pan where the seasoning has worn down or even rusted, don't despair! You'll just need to strip it down to the bare metal and start building it back up again.

In either situation: a brand new pan or a worn-out old pan, you can follow these steps. You'll just need a few things to get started:

↠ A stiff brush (for new cast iron) or steel wool (if restoring an old pan)
↠ Dish soap
↠ Paper towels
↠ Aluminum foil
↠ Unsaturated oil

What is the best oil to season cast iron with?

Unsaturated oils are best for seasoning because their chemical structure is more reactive than saturated oils. This makes it easier for them to polymerize to the metal. Saturated oils, like bacon grease and lard, were commonly used in the past because they were cheap, readily available, and unsaturated enough to get the job done, but from a molecularly perspective they're less than ideal.

While most unsaturated oil will do, there is a growing consensus that pure, organic flaxseed oil is the best – especially for a major re-seasoning. Its most desirable quality is that it is technically a drying oil (essentially the food-grade equivalent of linseed oil). That means flaxseed oil starts to harden when exposed to air, which can help create a rock hard polymerized layer on your cast iron.

However, flaxseed oil is expensive and can be difficult to find. Because it is sold as a supplement, it's often located in the refrigerated health/wellness section of the grocery store, rather than on the shelf with other cooking oils. It can also be found on Amazon. Make sure the oil you purchase is organic, and that the only ingredient listed is "organic flaxseed oil".

If flaxseed oil seems a little too expensive or hard to track down, we recommend grapeseed oil.

Step by step photos of how to season cast iron

Cast iron seasoning, step-by-step:

1. Start with a Clean Slate
Get your brush or steel wool wet and with a drop of dish soap, scrub down the entire pan: top, bottom, sides, and handle – the whole thing. If the pan has any rusty spots, be sure to scrub them down to the bare metal. When you're finished there should be zero rust on the pan.

A quick note to the anti-soap fanatics. The whole anti-soap mantra is a holdover from when soap used to be really harsh. Today's dish soap is far gentler and a little bit will not ruin your cast iron. More on this later, but for now, a little bit of dish soap to prep your cast iron for re-seasoning is fine.

2. Rinse & Dry
Rinse the pan off and dry it. It's important to get the pan as dry as possible. If it's humid out or you're just having a hard time getting the pan completely dry, place it on a burner over medium heat until all the water evaporates off.

3. Oil Rub
Once the pan is dry (and cooled), rub a small drop of your oil into the pan with a paper towel. You're looking to coat the entire pan with a thin layer of oil: the top, bottom, sides, and handle. Take care to wipe away any excess – extra oil lingering on the pan will end up being sticky after the heating process, which is not the result we're going for! The pan should look nearly dry once you're done with this step.

4. Bake
Once covered in oil, place your cast iron upside down on the middle rack of your oven and turn it on to 450F. It can be helpful to put a sheet of aluminum foil on the bottom rack to catch any drips. (However, if you only put down a thin layer of oil there shouldn't be any.) Bake for 1 hour.

5. Cool
Turn the oven off and let the cool with the oven door closed. This can take a while, so be patient! Once the pan has cooled completely, remove.

6. Repeat
Repeat steps 3-5 for at least another two times (more if you have time for it!).

At the end of the process, the seasoning on your cast iron should be a glossy, nonstick black.

Cooking eggs in a cast iron skillet on a campfire

Cooking with cast iron

One of the easiest ways to maintain the seasoning on your cast iron is to cook with it regularly!

Using your pan to saute, fry, or sear is a great way to continually add to your seasoning. But before you start cooking, there are a few things you want to know about first.

Preheat: Cast iron takes longer to heat up than other types of cookware. So before you start cooking, it's a good idea to preheat your pan for a little bit. Additionally, preheating your pan will help prevent food from sticking to it while you cook.

Use cooking oil: Using a little cooking oil never hurts when sauteeing. Depending on what we're cooking, we usually add a little bit of oil into the pan, particularly for dishes like eggs.

Avoid super acidic foods: While it's fine to cook a quick tomato sauce or occasionally deglaze with some white wine, you'll want to avoid cooking really acidic foods for an extended period of time. Over time those acids will start to break down the pan's seasoning.

Metal utensils are fine: Unless you are really gouging at it, metal utensils will not damage the seasoning of your cast iron if you have a good layer.

How to clean your cast iron

The best time to wash your cast iron is after it has cooled down a bit, but not completely. A still-warm pan makes washing very easy. If you've let it cool completely, don't worry. Put some water in it and place it back over the heat until it's warm again.

There are a lot of myths and misconceptions when it comes to washing your cast iron. So let's set the record straight.

Soap, in moderation, is fine. Some people have worked themselves into hysterics over this, but soap will not adversely affect your pan's seasoning. That's because the seasoning isn't oil anymore. It has undergone a chemical reaction and is now a polymerized plasticized coating. So a little bit of soapy water isn't going to wash it away. Plus, as mentioned above, dish soap far gentler now. They are not going to rip through your seasoning like lye soaps of the past.

While soapy water won't hurt, it's not necessary either. Hot water is often all we use when we're out camping.

Pick Up a Pan Scraper. We use a pan scraper to scrape off anything that's stuck to the pan (while it's still warm is best!). The scraper is plastic, so it's still gentle enough even if you have to put some elbow grease into it! Alternatively, you can use a bristle brush, cast iron chainmail, or coarse kosher salt. The goal is remove 100% of the food particles stuck to the pan.

Don't Over Scour. Avoid using an actual scour pad or steel wool, which can be a little too aggressive and will wear away the seasoning.

Rinse & Dry Completely. It is critical to ensure the pan is completely dry. Even a small amount of water can result in rust.

How to store cast iron

If your cast iron has a really great seasoning on it already, then it is fine to store it after washing and drying it. But if you want to add to the seasoning (or are very protective of the season you've built) then you will want to do the following:

Wipe the inside of your pan with a very thin layer of oil. If you have flaxseed oil laying around, great. If not, a little grapeseed oil will do the trick just as well. Place your pan on a burner and heat until it starts to smoke. Turn off the heat and let cool. This will process prevents the oil from turning rancid.

Once it has cooled down, store your cast iron someplace dry.

So, there you have it! Treat your cast iron well, and it will treat you well for years to come.

Sources & further reading:
A Science Based Technique for Seasoning Cast Iron by Sheryl Canter

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