1. Let steak stand in the refrigerator uncovered 1-2 days. Let stand at room temperature 1 hour before cooking.
2. Preheat oven to 300°F. Sprinkle salt and pepper on steak. Place steak in oven for 20 minutes. Remove from oven and skillet. Heat oil and butter in skillet until hot. Add steak and sear 1-2 minutes on both sides. Remove steak and let rest 10 minutes.
3. Meanwhile add chopped garlic, and fresh thyme to skillet. Cook 1 minute, adding juices from steak back into skillet. Slice steak and serve with garlic herb au jus.