Prick all sides of flank steak with a fork; place in a shallow dish. Combine oil, teriyaki sauce, grated onion, honey, garlic powder, and ginger; pour over the steaks. Cover and marinate overnight in the refrigerator, turning occasionally.
Remove the steaks from the marinade. Grill over hot coals for 4 to 5 minutes on each side, or until done. Slice thinly across the grain.
Servings: 6