In a small bowl, combine all the ingredients except steak and green onion. Add steak to a large resealable plastic bag. Add marinade ingredients. Seal and turn to coat; refrigerate for several hours or overnight, turning now & then.

Drain and discard marinade from steak and lightly pat dry, leaving as much garlic and ginger as possible on steak. Let sit at room temperature for 30 minutes.

Preheat grill to high, turn down to medium and add steak. Cook, turning once, over medium heat three to five minutes on the first side (until fairly charred) and two to three minutes on the second or until desired temperature is reached.

Alternately, broil 3 inches from the broiler unit for three to five minutes, turn and broil on the other side an additional three to five minutes or until meat reaches desired doneness.

For medium-rare, a meat thermometer should read 145°; medium, 160°; well-done, 170°.

Let stand for 15 minutes and slice thinly across the grain. Sprinkle with green onion if desired.