1. Wash pig bones and ox bones, soak them in boiling water for 10 minute, take them out and put them in a stainless steel bucket, add 15 kg of clean water, boil them with slow fire for 5 hours, and filter to keep soup.

2. Add salad oil into the pot, add Tsaoko, cinnamon, licorice, star anise, citronella, Amomum villosum, fennel, clove, fragrant leaves, pepper, dried tangerine peel, Yangjiang lobster sauce and dried pepper, stir-fry for15min, take out spices, wrap them with gauze and 70% spices, and cook them in soup for 2min.

3. Leave 30 grams of oil in the pot. When it is 50% hot, add tofu and stir-fry for 2 minutes. Add salt, monosodium glutamate, chicken powder, crystal sugar and soy sauce and bring to a boil. Pour into a stainless steel bucket and stir well.