(Yield: 4 servings)
1 pound boneless beef sirloin or round steak
1 tablespoon Kikkoman Stir-Fry Sauce
2 tablespoons vegetable oil, divided
2 medium bell peppers, cut into 1-inch squares
2 medium onions, cut into 1-inch squares
1/4 cup Kikkoman Stir-Fry Sauce
Cut steak across grain into thin strips, then into 1-inch squares; coat with 1 Tbsp. stir-fry sauce. Heat 1 Tbsp. oil in hot wok or large skillet over high heat. Add beef and stir-fry about 1 minute; remove. Heat remaining oil in same pan. Add peppers and onions; stir-fry 5 minutes. Stir in beef and 1/4 cup stir-fry sauce; cook and stir just until beef and vegetables are coated with sauce. Serve immediately.