Not sure if this is a vintage recipe but it is one I have had for years. I got it from an old yellowed copy in my late mother's recipe shoe box!
1 flank steak, approximately 1 1/2 lbs
3 tbsp soy sauce
1/4 cup green onion slices
2 tbsp toasted sesame seeds
1 garlic clove, minced
1/4 tsp ground ginger
Score steak on both sides with a sharp knife. Mix all ingredients, except steak, in a small bowl; pour over steak. Cover and marinate in the refrigerator 7 or 8 hours or overnight; turning once. To cook steak, remove from marinade and place on a broiler pan or grill that has been sprayed with nonstick cooking spray. Broil or grill over hot coals for approximately 20 minutes or until of desired doneness. Brush with barbecue sauce about half way thru the cooking time. To serve steak, carve across the grain into thin slices.
Yield: 4 to 6 servings.