Preheat oven to 400°F Combine oil, salt, paper, garlic and oregano. Rub over beef. Place on rack in roasting pan and roast for 45 minutes Combine wine, vinegar and onion. Pour over beef in pan. Roast for 15 mins or until done to desired doneness. Let rest for 15 minutes before slicing. While meat is resting, transfer drippings to small pot over medium high heat. Reduce to medium low, stiring often until slightly reduced. Serve with beef.