1. Cut the fish belly, wash all the attachments in the belly and cut into small pieces;

2. Mix the fish pieces with bean flour and salt to taste;

3. Slice (or mash) ginger and garlic; 4. Put ginger slices, garlic slices, watercress, soy sauce and sugar in the same bowl;

5. Cut the dried peppers into sections and put them in the same bowl;

6. Cut the onion into sections;

7. Put the cooked oil in the pot and heat it until it is medium-cooked. Put ginger, garlic slices, watercress, soy sauce and sugar into a pot and stir-fry slowly;

8. Stir-fry until bright, then add soup or water (water will drown the fish pieces);

9. After boiling, change to medium heat and cook for a few minutes, then pour in the fish pieces and cook for 7 ~ 8 minutes;

10. Add crispy pepper, pepper powder, monosodium glutamate and onion, and mix well to serve.