Cut meat into 2 x 1/2 x 1/4" strips. Heat oil in large wok. Stir fry 1/2 lb. meat at a time, browning pieces on all sides. Remove meat from wok as it is browned. When all meat is browned, return to wok. Cover and cook over low heat for 30 minutes. Add 1 cup of water, celery and onions. Bring to a boil, reduce heat and simmer, covered, for 20 minutes. Blend cornstarch, 1/4 cup water, soy sauce, and molasses. Stir into meat mixture. Bring to a boil; cook 2 minutes, stirring constantly. Add bean sprouts and water chestnuts. Serve on hot, fluffy rice.