1. Mix boiled water with bean sprouts (note: it is best to cook the soup with a single bean sprout, which smells like beans) and common vinegar at a ratio of 4: 1, that is, 4 parts of boiled water with bean sprouts and 1 part of vinegar to make mixed juice.

2. Put a proper amount of spices such as onion, ginger, garlic, dried pepper, dried tangerine peel, pepper, Amomum tsaoko, cinnamon, fennel, clove, star anise, fragrant leaves, Amomum tsaoko and tea into the mixed juice of water soaked with soybean sprouts and vinegar.

3. Boil the spice mixed juice with high fire, then cook it with low fire for one hour, then put it in a container with spices and let it cool for later use.