1 beef chuck 7-bone steak, cut 3/4 to 1 inch thick (about 2 pounds)
1 cup finely chopped onion
1 cup ketchup
1/3 cup packed brown sugar
1/3 cup red wine vinegar
1 tablespoon Worcestershire sauce
1/8 to 1/4 teaspoon crushed red pepper
1. Combine marinade ingredients in medium bowl. Place beef steak and 1 cup marinade in food-safe plastic bag; turn to coat. Close bag securely and marinate in refrigerator 6 hours or as long as overnight, turning occasionally. Refrigerate remaining marinade.
2. Remove steak; discard marinade. Place steak on grid over medium, ash-covered coals. Grill, uncovered, 15 to 18 minutes for medium rare to medium doneness, turning occasionally.
3. Place remaining marinade in small saucepan; bring to a boil. Reduce heat; simmer 10 to 15 minutes or until sauce consistency, stirring occasionally.
4. Cut steak into serving-size pieces. Serve with sauce.