1 Combine marinade ingredients in medium bowl. Remove and reserve 2 tablespoons. Stack beef steaks; cut lengthwise in half, then crosswise into 1-inch wide strips. 2 Add beef to remaining marinade; toss.3 Heat large nonstick skillet over medium-high heat until hot.4 Add 1/2 of beef; stir-fry 1 minute or until outside surface of beef is no longer pink. (Do not overcook.) Remove. Repeat with remaining beef.5 Combine vegetables and 1/4 cup water in same skillet; cook over medium-high heat 4 to 5 minutes or until most of water is evaporated and vegetables are hot, stirring occasionally. Combine cornstarch mixture and reserved marinade. 6 Add to vegetables; cook and stir 1 minute or until thickened and bubbly. Add beef; heat through. Serve over rice. Sprinkle with walnuts.