1. Take half of the fish
2. Remove the bones from the belly of the fish
3. Slice the fish with an oblique knife, remember not to cut off the skin
4. Change to flower knife
5. Add water, cooking wine, salt, ginger, garlic to the bowl to remove the smell, soak for 20 minutes
6. Scoop up and remove the ginger garlic
7. Add cornstarch and custard powder
8. Fry in oil pan and put on a plate for later use (this must be heated to set the shape)
9. In another pot, add yam, tomato sauce, white vinegar, white sugar, mix well, and pour on the fish
10. carry out
