Step 1) Combine corn oil, vinegar, soy sauce,onion, garlic and ginger in a 1 gallon resealable plastic bag. Add steak, turning to coat. Place bag in a medium size bowl; refrigerate, 2 hours or overnight.
Step 2) Remove steak from marinade. Grill or broil 6 inches from heat, turning once, 8 minutes for medium rare or until desired doneness. Thinly slice diagonally across the grain.