1 porterhouse steak, about 24 oz (680 g) (at least 1 1 / 2 inches thick), very cold 2 tsp kosher salt 1 tsp coarsely ground black pepper 1 tbsp high-smoke-point oil (grapeseed or avocado) (15 ml) 1 tbsp unsalted butter (optional) (15 g)
1. Keep the steak refrigerated until just before cooking to maintain a cool center; pat dry thoroughly. 2. Season heavily with salt and coarse pepper; rub lightly with oil. 3. Heat a cast-iron skillet over high until smoking hot (or use a blazing hot grill). 4. Sear 2–3 minutes per side without moving to achieve an intense char; sear edges on the bone 30–60 seconds. 5. For true “blue,” serve immediately after a brief rest; for rare, move to a cooler spot 2–3 minutes more. 6. Optional: Add butter to the pan in the last 30 seconds and baste for a glossy finish.
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