How to Cook the Perfect Cast Iron Steak

The whole secret to a great steak at home is a dry surface meeting a screaming-hot, heavy pan — and cast iron is the best pan for the job because it holds that heat when the cold steak lands. Dry the meat, salt it, rip the pan hot, do not crowd it, flip once, baste with butter, and rest it. That is the entire method. Everything below is the why and the how.

Why cast iron sears best

A good crust is the Maillard reaction — the browning between amino acids and sugars that builds deep, savory flavor, and it runs fastest from roughly 280 to 330°F (140 to 165°C) at the meat's surface. To hit that quickly you need a pan that is hot and, crucially, one that stays hot when a cold, wet steak hits it. That is thermal mass, and cast iron has it in spades: it stores a large amount of heat and barely dips when you load it. A thin pan's temperature crashes on contact and you end up steaming grey meat instead of searing brown crust. The heavy iron pan is the whole trick.

The method, step by step

1. Temper and dry the steak. Pull it from the fridge 30 to 45 minutes ahead so it is not fridge-cold in the center, then pat it bone drywith paper towels on every surface. Surface moisture is the enemy of a crust — it has to boil off before browning can even start, and that steals your heat.
2. Salt generously, and time it. Season all over with kosher salt. Either salt right before it goes in the pan, or salt at least 40 minutes ahead so the surface has time to reabsorb the drawn-out moisture and dry again. The one window to avoid is the 3-to-30-minute range, where the surface is wet with brine and will not sear.
3. Rip the pan hot.Preheat the dry cast-iron pan over medium-high for a good five minutes — longer than feels necessary. Add a thin film of a high-smoke-point oil (grapeseed, avocado, refined canola) and wait for it to shimmer and just begin to smoke. That shimmer-and-whisper of smoke is your signal.
4. Lay it down away from you, and leave it alone.Set the steak into the pan laying it down away from your body so the oil does not splash toward you. Do not move it, do not poke it, do not crowd two big steaks into one pan — give each 2 to 4 minutes of undisturbed contact so a crust can form and release on its own.
5. Flip once, then baste.When the first side has a deep brown crust, flip it a single time. Now add a knob of butter, a smashed garlic clove, and a sprig of thyme or rosemary; tilt the pan and spoon the foaming butter over the steak for the last minute or two. This is the steakhouse move — the flavored fat bastes the top while the bottom finishes.
6. Pull it early, by temperature.Check the center with an instant-read thermometer and pull the steak about 5°F below your target, because it keeps cooking as it rests (carryover). Guessing by feel works once you have done it a hundred times; until then, the thermometer is what separates a perfect medium-rare from a sad grey one.
7. Rest it. Move the steak to a board or warm plate and let it rest 5 to 10 minutes before you cut. Resting lets the juices redistribute so they stay in the meat instead of running onto the board.

The reverse sear, for thick cuts

For a steak thicker than about an inch and a half — a big ribeye, a strip, a thick filet — the reverse sear gives you edge-to-edge even doneness with a great crust. Put the salted steak on a rack in a low oven (around 250°F) and cook it slowly until the center is roughly 10 to 15°F below your target. Then rip a cast-iron pan as hot as you can and sear the already-warm, dry steak hard for about a minute a side. Because the interior is already where you want it, the sear is purely about the crust, and there is almost no grey band under the surface. It is more forgiving than the straight sear, and cast iron's heat retention is exactly what makes that final blast work.

Temperatures worth knowing

A few things I have learned the hard way

Ventilate — a proper sear smokes, so open a window and run the hood. Use a pan that is well seasoned, because a slick surface releases the steak cleanly and a bare, sticky one tears the crust you just built. And do not try to sear four steaks in one skillet; crowding drops the pan temperature and everything steams. If you only own one pan for this, make it a heavy 10.25-inch or 12-inch skillet from our best cast iron skilletsguide — the mass is the point, and those are the pans that have it.