Trim the green beans and cut each one in half. Boil them in ample water for 2 minutes and drain well. Cut the bean curd into 3/4-inch cubes. Crush and chop the garlic. Heat the oil in a frying pan or wok. When hot, add the garlic, salt, and green beans. Stir-fry over medium heat for 2-1/2 minutes. Add the bean curd pieces and turn them lightly with the beans for 1-1/2 minutes. Pour in all the sauce ingredients. Turn and stir them together for 1 minute. Cook and turn for 1-1/2 minutes and serve. Serves 4-5 with rice and other dishes.