Debone chicken. Cube meat, onion, and celery. Cut pineapple slices into eighths. Mix cornstarch, soy sauce, and water, and brush over chicken. Saute onion in 1 tablespoon peanut oil. Add celery, stir 1 minute, and set aside. Saute chicken in 3 tablespoons oil. Add vegetables, pineapple, and syrup. Serve over rice, if desired.