Remove steak from oven and spoon one-third of spice-infused butter over, making sure to coat both sides. Poke thermometer probe in the center of the strip side and roast steak, basting every 30 minutes or so with remaining butter, until thermometer registers 120°, 1–1½ hours. Alternatively, use an instant-read thermometer to check steak every 15 minutes after the first hour, and every 5 minutes after 1½ hours. Once thawed, the temperature of the steak will rise about 1 degree a minute.