Place meat in self-closing plastic bag. Combine orange juice, soy sauce, ginger; garlic powder and red pepper. Reserve half of the marinade; pour remaining marinade over steak. Marinate in refrigerator 15 minutes.
Sauté beef and 3 teaspoons toasted sesame seeds in hot oil in a large skillet over high heat about 3 minutes or until beef is browned. Remove beef from skillet and keep warm. Add vegetables and cook and stir until crisp tender, about 3-5 minutes.
Combine reserved marinade with cornstarch and sugar. Add to skillet and bring to a boil. Return beef to skillet. Stir and heat through. Top with remaining 1 teaspoon toasted sesame seeds and serve over rice, if desired. Makes 6 servings