Preheat oven to 350 degrees In a large sautee pan heat the oil and sear all sides of the tenderloin until golden brown. After brown, place meat on a rack in a roasting pan. Pour worchestershire sauce covering the meat. Then mix rosemary, garlic, and steak seasoning together in a small bowl. Rub this mixture into the meat to cover. Roast meat until internal temperature reaches 130 -140 degrees (for medium) (Approx. 30-45 minutes) Transfer meat to a cutting board and let rest 10-20 minutes... loosely covered. Slice and serve.