about 3 minutes. Remove beef and onion to a platter. Add celery, mushrooms and 3 tablespoons water to wok. Stir fry until mushrooms are wilted. Cover wok about 2 minutes. Add beef back to wok, stir fry all ingredients about 1 minute. Place all in platter. NOTE: If desired, a corn starch solution may be made to form gravy with this dish.