Combine all ingredients in a glass dish or zip top plastic bag. Refrigerate 30 minutes.
Preheat grill over medium heat. Remove steak from marinade. Discard marinade. Grill steak 4 minutes per side (longer for thicker steaks or for more well done steaks, to desired doneness). Slice against the grain. Top with fresh basil, if desired.
Preheat broiler. Remove steak from marinade. Discard any remaining marinade. Broil steak 5 minutes per side or until it has reached desired doneness.