cornstarch • chicken or vegetable broth • firm tofu or 1 lb skinless, boneless chicken breast • cornstarch • tamari • neutral oil • sesame oil • celery, thinly sliced • large carrot, sliced diagonally into 1/4-inch pieces • small onion, halved and cut into 1/4 inch slices • green beans (approx. 20 units), sliced diagonally into 1/2-inch pieces • garlic, minced •