Preparation

Combine marinade ingredients in small bowl. Place beef steak and 1/3 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. Remove steak; discard marinade. Brush bell peppers with some of remaining marinade. Place steak and peppers on grid over medium, ash-covered coals. Grill flank steak, uncovered, 17 to 21 minutes for medium rare to medium doneness (top round steak 16 to 18 minutes for medium rare), turning occasionally. Grill peppers 12 to 15 minutes or until tender, turning occasionally. Brush steak and peppers occasionally with remaining marinade; do not brush during last 5 minutes. Carve steak across the grain into thin slices. Season with salt. Serve with peppers.