
Thickness is mandatory for the reverse sear to work without overcooking the center. • 📍 Costco or local butcher.
Season the steak generously all over with 1 tbsp coarse kosher salt and 1 tsp freshly ground black pepper on a wire rack set over a rimmed sheet pan, then refrigerate uncovered for 8 to 24 hours.
✓ Checkpoint: Dry, dark red surface.
Roast on the wire rack at 250°F (121°C) until an instant-read thermometer in the center reads 115°F (46°C) for a medium-rare target (or 130°F / 54°C if targeting the 145°F / 63°C USDA final standard).
✓ Checkpoint: Warm exterior with dry matte finish.
Heat a cast-iron skillet with 1 tbsp high-smoke-point neutral oil over high heat until heavily smoking.
✓ Checkpoint: Skillet shimmering at 500°F+.
Sear steak 45 seconds per side, adding 2 tbsp unsalted butter, 3 crushed garlic cloves, and 4 fresh thyme sprigs to baste until internal temperature reaches 130°F (54°C) for medium-rare (or 145°F / 63°C with a 3-minute rest for USDA standard). Transfer to board and carve immediately.
✓ Checkpoint: Dark crackling crust, wall-to-wall pink.
Desiccated Surface for Maillard: Low-heat oven baking at 250°F (121°C) evaporates surface moisture completely, allowing blistering Maillard browning in cast iron within 45 seconds.
Thick grey band under crust: Skillet must be screaming hot (over 500°F) and sear limited to 45 seconds per side.