Rinse steak and pat dry; place in large plastic food storage bag. Combine soy sauce, sugar, green onions, garlic powder and ginger; pour over steak. Press air out of bag; close top securely. Turn bag over several times to coat steak. Refrigerate at least 2 hoursor overnight, turning bag over occasionally. Grill or broil steak to desired doneness. Slice thinly; serve in lettuce leaves with Thai Style Chili or Plum Sauce for dipping.
Place 1 spoonful of rice into each lettuce leaf and top with steak and red onion.