Combine orange juice, brown sugar, soy sauce, TABASCO® SWEET & Spicy Sauce, and olive oil in a container large enough to hold steak and stir until sugar dissolves. Add steak and onion, turning to coat steak with marinade. Cover and refrigerate 2 to 12 hours.
Heat a grill or grill pan to medium-high. Grill steak and onions to desired doneness, about 5 minutes per side for medium-rare.
Makes 4 servings.