For marinade, combine tomato juice, oil, basil, oregano, pepper, and garlic. Set aside. Trim fat from steak and cut into 4 equal portions. Place meat in a plastic bag set in a deep bowl. Pour marinade over steak. Seal bag; turn to coat steak well. Marinate overnight in the refrigerator. Then, drain steak, reserving marinade. Place onion slices on an 18" square of heavy foil. Turn edges of foil up slightly. Drizzle 1/2 cup of the reserved marinade over onions. Fold foil tightly to seal. Grill onion packet and steak on an uncovered grill directly over medium coals for 10 minutes. Turn onion packet and steak; brush steak with marinade. Grill steak to desired doneness, allowing 8-10 minutes more for medium. Grill onions 8 minutes more or till tender. Unwrap onions and place on a serving plate. Arrange meat atop onion. Spoon any remaining sauce from onions over the meat.