Steak is marinated in the fridge for 45 minutes, then quickly pan-seared in a cast iron skillet before it is finished in the oven.
The acidic marinade effectively tenderizes and infuses flavor into the sirloin; ensure steaks come to room temperature before cooking for even doneness. A screaming hot cast-iron skillet is crucial for achieving a superior Maillard crust—do not overcrowd the pan. Oven-finishing allows for precise internal temperature control; use an instant-read thermometer for accuracy (130-135°F for medium-rare). Always rest the steak for at least 5 minutes after cooking to allow juices to redistribute, ensuring a tender and moist result. Consider finishing with a knob of butter and fresh herbs like rosemary or thyme in the skillet during the last minute of searing for added aroma and flavor.