2 1/2 lb flank steak
1 cup teriyaki sauce
10 green onions, chopped, divided
1/2 cup rice vinegar
4 tsp sesame oil
1/2 tsp salt
1/2 tsp ground red pepper or cayenne
2 tbsp brown sugar
4 tbsp sesame seeds, toasted
1. Thinly slice steak across the grain. Place steak in re-sealable plastic bag; add teriyaki sauce and 6 of the chopped green onions; seal bag and refrigerate 1 hour.
2 Preheat grill to medium. Remove steak from marinade; discard marinade. Thread steak slices onto 10 to 12 inch metal skewers.
3 Grill skewers, covered, 5 to 7 minutes per side to desired doneness.
4 For sauce, combine remaining green onions, vinegar, oil, salt, red pepper and brown sugar in small bowl. Stir in sesame seeds. Serve steak skewers with sauce.