Red pepper flakes add just the right amount of heat to the honey-soy marinade. This recipe is delicious, whether you grill or broil the steak.
Combine soy sauce, vinegar, honey, orange juice, oil and pepper flakes in a 2-gallon plastic food-storage bag. Add flank steaks; seal; turn to coat with marinade. Refrigerate at least 2 hours. (Can be refrigerated overnight.)
Heat broiler or grill. Remove steaks from bag; drain marinade into small saucepan.
Broil or grill steak 4 inches from heat about 5 minutes on each side for medium-rare (145 degrees F). Let steak stand 5 minutes; keep warm.
Meanwhile, bring marinade to boiling and boil 3 minutes. Thinly slice steaks across grain. Serve with marinade.