1 porterhouse steak, about 1.5–2 lb (680–907 g) (1.5–2 inches thick) 2 tsp kosher salt 1 tsp freshly ground black pepper 1 tbsp neutral oil 2 tbsp unsalted butter (divided) 1 large shallot, finely minced 1 / 2 cup (120 ml) dry red wine 1 / 2 cup (120 ml) beef stock 1 tsp Dijon mustard (optional) 2 sprigs fresh thyme
1. Preheat oven to 450°F. Pat steak dry; season with salt and pepper. 2. Heat oil in an oven-safe skillet over high heat. Sear steak 2–3 minutes per side until well browned; add 1 tablespoon butter. Transfer to oven 4–8 minutes to desired doneness. Rest on a board. 3. Pour off excess fat, leaving about 1 tablespoon. Sauté shallot with thyme 1 minute. Deglaze with wine; reduce by half. Add stock; reduce to a syrupy consistency. Off heat, whisk in remaining butter and Dijon; season to taste. Slice steak and spoon sauce over.
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