In a small bowl, combine all marinade ingredients; mix well. Add beef, stirring to coat. Cover. Marinate at room temperature for 15 minutes. In a 10-inch skillet, heat oil over medium heat. Add beef and marinade, and stir-fry until meat is no longer pink. Remove meat from skillet; set aside. Add vegetables. Stir-fry until tender-crisp. Return beef to skillet. Stir-fry until heated. Serve over rice.
Makes 4 servings.