Mexican broiled steak

1. * each flank steak should weigh between 1 and 1 ½ lbs.
2. Place beef steaks in shallow glass or plastic dish.
3. Mix remaining ingredients and pour over the beef.
4. Cover and refrigerate at least 8 hours, turning occasionally.
5. Set oven control to broil.
6. Place beef on rack in broiler pan.
7. Broil with the tops about 3 inches from the heat until brown, about 5 minutes.
8. Turn beef and broil about 5 minutes longer.
9. Cut beef in thin strips across the grain of the meat.
10. Serve with tortillas and guacamole if desired