1. Clean the fish, cut it off, add salt, dark soy sauce, ginger, green onion and marinate for 10 minutes
2. Heat the pan with cold oil, wait until the oil is 80% hot, add the fish cubes
3. Fry both sides slightly yellow, vinegar, add garlic, dark soy sauce, Pixian watercress, add water to the fish, do not add too much water
4. Bring to a boil, change to low heat and simmer for 30 minutes, and finally collect the juice from high heat
5. Serve, add some coriander
