2. Put a proper amount of water, soy sauce, salt, shallots, ginger pieces and five spice bags on a high fire, boil for about 30 minutes, and beat them into a marinated soup. Then put in the bundled dried tofu, boil it, switch to a low fire, add monosodium glutamate when the marinated soup is thick, and stir well. When the juice has penetrated into the dried tofu, take out the spice bag (for use next time) and take out the dried tofu.