How to Cook with a Cast-Iron Skillet

A cast-iron skillet rewards a small amount of ongoing care with a cooking surface that lasts for decades and only gets better with use. It holds heat more evenly than most lighter pans, handles high stovetop heat and a hot oven with no issue, and builds up a naturally nonstick surface over time. It also has a short list of real rules, and most of the bad reputation cast iron has for being fussy comes from a few habits that are easy to fix.

None of this requires special products. A well-maintained skillet needs oil, heat, and a few minutes of care after each use, not a specific soap or a cabinet of accessories.

Why cast iron behaves differently than other pans

Cast iron is thick, dense, and a relatively poor conductor of heat compared to metals like aluminum or copper, which sounds like a disadvantage but works in its favor for certain kinds of cooking. It takes longer to heat up, but once hot, it holds that heat steadily and recovers quickly after cold food is added, which is exactly what a good sear needs. Its surface is also naturally a little rough at a microscopic level, which is what allows a coating of polymerized oil, known as seasoning, to bond to it over repeated use. That seasoning layer is what gives a well-used skillet its dark color and its nonstick quality, and it’s built and maintained through cooking, not through a one-time treatment.

Using it well, step by step

1. Preheat gradually. Put the empty skillet on medium heat for a couple of minutes before adding oil or food. Cast iron heats unevenly if you rush it on high heat right away.
2. Add enough oil to coat the surface. A thin, even layer helps food release cleanly and protects the seasoning during cooking.
3. Let food sear before moving it. Just like with any pan, food releases naturally once a crust forms. Forcing it off early tears the crust and can pull at the seasoning underneath.
4. Use it for high-heat and oven tasks. Cast iron transitions from stovetop to oven without any issue, which makes it useful for dishes that start with a sear and finish roasting, like a thick pork chop or a skillet cornbread.
5. Clean it while it’s still warm. Once you’re done cooking, let the pan cool just enough to handle safely, then clean it before it sits with food residue for hours.
6. Wash with water and a stiff brush or sponge. A small amount of mild soap is fine occasionally and won’t ruin a well-built seasoning layer, despite the old rule against it; what actually damages seasoning is prolonged soaking or a scouring pad used aggressively enough to strip the surface.
7. Dry it completely and immediately. Towel-dry, then set it on the stovetop over low heat for a minute or two to drive off any remaining moisture. Cast iron left even slightly damp will start to rust.
8. Rub in a very thin layer of oil while it’s still warm. Wipe on a few drops of a neutral oil with a paper towel, then wipe off any excess so the surface looks dry, not greasy. This maintains the seasoning between uses.

Building and maintaining seasoning

Seasoning improves through repeated cycles of oil and heat, which is why cooking with the skillet regularly, especially foods with some fat, does more for it than any single seasoning session. If a new skillet arrives with a dull, gray surface or an older one has lost its shine in patches, you can rebuild it: coat the entire pan, inside and out, in a very thin layer of neutral oil, wipe off as much as you can so it looks almost dry, and bake it upside down in a 450°F to 500°F oven for an hour, with foil underneath to catch drips. Repeating this two or three times builds a durable base layer, and everyday cooking keeps adding to it from there.

Choosing a skillet

A 10 or 12-inch skillet covers most everyday cooking, with the larger size better suited to searing more than one piece of meat at once without crowding. Pre-seasoned skillets, sold by most major cookware brands, arrive ready to use and only need light maintenance from the first cook onward, while vintage or secondhand cast iron sometimes needs a full reseasoning if it’s rusty or sticky from years of inconsistent care. A skillet with a smoother factory finish will feel closer to nonstick sooner, while a rougher-cast one takes a bit longer to build up a comparable surface, though both perform the same once well seasoned. Either way, weight is a reasonable stand-in for quality: a flimsy, lightweight pan marketed as cast iron often isn’t thick enough to hold heat the way real cast iron does.

Common mistakes to avoid

• Letting it soak in the sink: Standing water is what actually causes rust and seasoning breakdown, not the occasional use of soap.
• Simmering acidic sauces for a long time: Tomato sauce or wine reductions cooked for extended periods can react with the seasoning and dull it, or pick up a metallic taste. A quick deglaze is fine; a two-hour simmer is not.
• Storing it while still slightly damp: Even a small amount of leftover moisture under a lid or in a stack of pans is enough to start rust.
• Skipping the oil rub after cleaning: Bare cast iron left unprotected between uses is what leads to the dull, sticky, or rusty surfaces people associate with hard-to-maintain skillets.
• Using high heat with too little oil for delicate foods: Eggs and fish in particular need a well-seasoned surface and enough oil to actually stick and tear less; a thin, dry skillet will grab these foods no matter how well seasoned it is otherwise.

More helpful reads

• How to Sear Meat and Make a Simple Pan Sauce
• How to Saute Vegetables Without Making Them Soggy
• How to Choose Cooking Oil
• Egg Cooking Techniques
• Browse more Cooking Techniques

By the Coco Kitchen Editorial Team.