How to Care for a Cast Iron Pan

A well-cared-for cast iron pan can last for decades and even be handed down. It holds heat well, goes from stovetop to oven and, with proper seasoning, becomes naturally non-stick. Caring for one is less fussy than people think.

Key takeaways

• Seasoning is a thin layer of baked-on oil that protects the pan and makes it non-stick.
• Clean it soon after use with hot water and a brush, then dry it fully.
• A light coat of oil after drying helps prevent rust.
• Rust can be removed and the pan re-seasoned.
• Avoid long soaking, and take care with very acidic dishes in a new pan.

What seasoning is

Seasoning is not a flavouring. It is a layer of oil that has been heated until it polymerises, bonding to the metal and forming a hard, slick coating. Over time, repeated cooking with fats builds up and improves it. Many modern pans come pre-seasoned, though extra layers help.

How to season a pan

1. Wash the pan with warm water, dry it thoroughly and warm it on the stove to remove any moisture.
2. Rub a very thin layer of oil with a high smoke point, such as vegetable, canola or flaxseed oil, over the whole pan, inside and out, then wipe off as much as you can with a clean cloth. The surface should look almost dry, because too much oil can become sticky.
3. Place the pan upside down in an oven preheated to about 230 degrees Celsius, or 450 degrees Fahrenheit, with a tray below to catch drips.
4. Bake for about an hour, then turn off the oven and let the pan cool inside.
5. Repeat a few times for a stronger layer.

Seasoning will produce some smoke, so ventilate the kitchen.

Everyday cleaning

While the pan is still warm, rinse it with hot water and scrub with a brush or non-scratch sponge. A little mild soap is fine on a well-seasoned pan, despite the old myth, though harsh detergents or dishwashers are best avoided. For stuck-on food, simmer a little water in the pan to loosen it, or scrub with coarse salt. Dry the pan right away with a towel and heat it briefly on the stove to evaporate remaining moisture. Wipe a few drops of oil over the surface before storing.

What to cook

Cast iron excels at searing meat, frying, baking cornbread and roasting vegetables. A well-seasoned pan is suitable for most foods. In a new pan, long-simmered acidic dishes like tomato sauce can strip seasoning and give a metallic taste, so save those for when the seasoning has built up. Preheat the pan gently, since cast iron heats slowly but holds heat for a long time.

Fixing rust and sticky spots

If you see rust, scrub it off with steel wool or a stiff brush, rinse, dry thoroughly and re-season. If the surface feels sticky, it likely has too much oil. Bake it again at high heat to harden it, or scrub and start the process again. A pan that has been neglected can almost always be restored.

Storage

Store the pan in a dry place. If you stack pans, put a paper towel between them. Do not store food in cast iron for long periods.

Safety

The pan and handle will be very hot, so use oven gloves. Do not put a hot pan into cold water, as sudden temperature changes can crack cast iron in rare cases.

Why seasoning sometimes goes wrong

Most seasoning problems come from using too much oil. A thick layer does not harden properly and can turn sticky or blotchy, and it may flake off in patches. If your pan feels tacky after baking, scrub it with hot water and a brush, dry it, and try again with a much thinner layer, wiping so that the surface looks almost dry before it goes into the oven. Using an oil with a smoke point below the oven temperature can also leave a gummy finish. Neutral oils such as vegetable, canola or grapeseed oil are common choices, and flaxseed oil is popular though some find its layer more brittle.

A dull grey or patchy surface is not harmful. It simply means the seasoning is still building. Regular cooking with a little fat improves it gradually.

Choosing a pan

There are three broad types. Pre-seasoned modern pans are ready to use and inexpensive. Vintage pans, often found second-hand, can have smoother cooking surfaces because older manufacturing polished them, but they may need restoring. Enamelled cast iron has a glass-like coating that does not need seasoning and resists acidic food, but it is a different product and care rules differ, for example avoiding very high heat when empty. A pan around 25 to 30 centimetres, or 10 to 12 inches, is a good all-round size. Check that the base sits flat on your hob and that the handle is comfortable, as the pan is heavy when full.

Cooking techniques that suit cast iron

Preheat the pan gently for a few minutes, because cast iron heats slowly and unevenly at first. Once hot, it holds heat well, which makes it excellent for searing steaks, browning chicken skin and frying. Add a little oil or fat before food goes in. For foods that stick easily, such as eggs, a well-built seasoning and enough fat help a lot. Cast iron also moves from hob to oven, so you can sear a piece of meat and finish it in the oven, or bake cornbread, frittatas and deep-dish pizzas directly in the pan. Always use oven gloves, because the handle stays hot.

Restoring an old or rusty pan

Rust looks alarming but is usually only on the surface. Scrub the pan with steel wool and soapy water until bare metal shows, rinse, and dry completely at once. Some people soak badly rusted pans for a short time in a half-and-half mix of water and white vinegar, but this should be limited to about half an hour because acid can pit the metal. After cleaning, season the pan several times in the oven. A restored pan often cooks as well as a new one.

Everyday habits that protect the pan

Avoid leaving water in the pan, avoid the dishwasher, and dry it every time. If you cook something very acidic or sticky, simply re-oil the pan afterwards. Store it with the lid off or with a paper towel to absorb moisture, in a dry cupboard. With these habits, a cast iron pan can last for generations.

Frequently asked questions

Can I use soap?

A small amount of mild soap is fine on a well-seasoned pan. Avoid prolonged soaking.

Can cast iron go in the dishwasher?

It is not recommended, as it can cause rust and strip the seasoning.

Is cast iron good for health?

It can add a small amount of iron to food, but it should not be relied upon as a health treatment.

Why does food stick to my cast iron pan?

Common causes are a pan that is not hot enough, too little fat, or seasoning that is still thin. Preheat the pan, use enough oil, and keep cooking regularly to build up seasoning.

Can I use metal utensils?

On a well-seasoned pan, metal spatulas are generally fine, although they can slowly wear the seasoning. Wooden or silicone utensils are gentler, and metal can be useful for scraping a stuck surface.

How often should I re-season the pan?

There is no fixed schedule. If food starts sticking, the surface looks dull or you see rust, give it a fresh oven seasoning. Regular cooking with fat usually keeps it in good condition.

Sources and further reading

• Cast-iron cookware (Wikipedia)
• Seasoning (cookware) (Wikipedia)