Cast Iron Skillet

A cast iron skillet is a heavy, thick-walled frying pan made from molten iron poured into a sand mold. In cooking, a cast iron skillet is prized for its exceptional heat retention — it stays hot when cold food hits the surface, which makes it the best pan for searing steaks, frying eggs, baking cornbread, and any technique that depends on consistent, high heat.

Cast iron cookware dates back to China's Han dynasty (206 BC), and cast iron skillets have been a kitchen standard in Western cooking since the 18th century. Unlike modern non-stick pans that wear out in a few years, a well-maintained cast iron skillet lasts generations — many cooks use skillets inherited from grandparents.

Why use a cast iron skillet

A cast iron skillet does a few things that no other pan material matches:

Heat retention. Cast iron is dense and heavy, so it stores a large amount of thermal energy. When you place a cold steak on a stainless steel pan, the temperature drops sharply. A cast iron skillet barely flinches — it stays hot enough to maintain the Maillard reaction and produce a deep, even sear without steaming the meat.

Oven-to-stovetop versatility. A cast iron skillet handles any heat source: gas, electric, induction, oven, broiler, grill, and campfire. You can sear on the stovetop and finish roasting in the oven without switching pans.

Natural non-stick surface. With proper seasoning (a polymerized oil layer), cast iron becomes naturally non-stick. The more you cook with it, the better the surface gets. No synthetic coatings that degrade over time.

Durability. There is no wear-out mechanism. Cast iron doesn't warp, the handle doesn't loosen, and the cooking surface improves with age. The only maintenance is seasoning.

How to season a cast iron skillet

Seasoning is the thin, hard layer of polymerized oil that protects the iron from rust and creates a non-stick cooking surface. When oil is heated past its smoke point, it bonds to the iron through polymerization — a chemical reaction that turns liquid fat into a solid, plastic-like coating.

Initial seasoning (for new or stripped pans):

1. Wash the skillet with warm soapy water and dry completely
2. Apply a very thin layer of high-smoke-point oil — flaxseed, grapeseed, or vegetable shortening. Use a paper towel to wipe off as much as possible. The pan should look almost dry
3. Place upside down in a 450°F (230°C) oven for one hour. Put foil on the rack below to catch drips
4. Turn off the oven and let the skillet cool inside
5. Repeat 3-4 times for a solid base layer

Why "almost dry" matters: Too much oil creates a sticky, uneven surface. The goal is a molecular-thin layer that polymerizes completely. Multiple thin coats build a better surface than one thick coat.

For a complete walkthrough, see our guide to seasoning cast iron.

Cast iron skillet care and cleaning

Daily cleaning is simpler than most people think:

1. Clean while warm. Rinse the skillet under hot water while it's still warm (not hot enough to burn). Use a stiff brush or chain mail scrubber for stuck food
2. Soap is fine. Modern dish soap won't strip seasoning. The old advice against soap dates back to when soap contained lye, which dissolves polymerized oil. Today's mild soap is safe
3. Dry immediately. Cast iron rusts fast. Towel dry, then place on a burner over low heat for 30-60 seconds to evaporate any remaining moisture
4. Oil lightly. While still warm, wipe a thin coat of oil over the cooking surface with a paper towel. This prevents rust between uses

What to avoid:

• Never soak cast iron or leave it in water
• Don't put it in the dishwasher
• Avoid metal utensils on new seasoning (well-seasoned pans handle metal fine)
• Don't store with the lid on — moisture trapped inside causes rust

Best uses for a cast iron skillet

The acid warning is often overstated. A quick deglaze with wine or a splash of lemon juice is fine on well-seasoned cast iron. The problem is simmering tomato sauce for 30+ minutes — prolonged acid contact strips seasoning and can give food a metallic taste.

Cast iron skillet sizes

A 12-inch skillet is the workhorse size for most home cooks. If you buy one cast iron skillet, buy that one.

Cast iron vs stainless steel vs non-stick

When to choose cast iron: searing, frying, baking, and any task where heat retention matters. When to choose stainless steel: acidic sauces, deglazing, and fond-building where you want to see the browning. When to choose non-stick: eggs, crepes, and delicate foods that stick easily.

Cast iron skillet myths debunked

"Never use soap." False. Modern dish soap is mild and won't strip polymerized seasoning. This myth comes from the lye soap era. Wash your skillet with soap whenever you want.

"Don't cook acidic foods." Mostly false. A quick deglaze with wine or vinegar is fine. Avoid simmering tomato sauce for hours — that's the scenario that actually damages seasoning.

"Cast iron heats evenly." False. Cast iron actually heats unevenly on the stovetop — the area directly over the burner gets much hotter than the edges. What cast iron does well is retain heat once it's hot. Preheat for 5-10 minutes, rotating the pan once, for the most even temperature.

"Old cast iron is better than new." Partly true. Vintage skillets (pre-1960s) were machined smooth after casting, creating a flatter cooking surface. Modern Lodge skillets have a slightly pebbly texture from sand casting. Both work well — modern pans just need a few more rounds of seasoning to build up a smooth surface.

Cast iron skillet in Fond

When a recipe in Fond calls for a cast iron skillet, Cook Mode highlights it in your equipment list during mise en place. For searing recipes that require preheating the pan, Cook Mode includes a preheat step with timing so the skillet reaches the right temperature before you start cooking.

Frequently asked questions

What oil is best for seasoning cast iron?

Flaxseed oil creates the hardest seasoning but can flake if applied too thick. Grapeseed oil and vegetable shortening (Crisco) are more forgiving. Any high-smoke-point oil works — the key is applying an extremely thin layer and heating past the smoke point.

How do I fix a rusty cast iron skillet?

Scrub the rust off with steel wool or a chain mail scrubber. Wash with warm soapy water, dry completely, and re-season from scratch (3-4 rounds in the oven). Surface rust doesn't damage the pan — it's just surface oxidation that comes off easily.

Is cast iron safe for cooking?

Yes. Cast iron leaches small amounts of dietary iron into food, which is generally beneficial (especially for iron-deficient individuals). The amount is highest with acidic foods and new, unseasoned pans. Well-seasoned pans leach very little.

What's the difference between a cast iron skillet and a Dutch oven?

A cast iron skillet is shallow and open, designed for searing, frying, and baking. A Dutch oven is a deep pot with a tight-fitting lid, designed for braising, stewing, and bread baking. Same material, different shapes, different purposes. Many home cooks own both.