1. Step 1: When making bad fish, you need to crisp up the fish bones. When cooking in advance, you need to marinate the fish first, so that the fish bones can be fried easily. First clean the prepared grass carp, remove the internal organs and cut into pieces for later use.

2. Step 2: Take an appropriate amount of red grains and apply it on the grass carp pieces. At the same time, add white wine and salt and stir evenly. This will not only make the grass carp more flavorful, but also make the fish bones easy to crisp.

3. Step 3: Seal the marinated grass carp pieces and place them in the refrigerator. After refrigeration for more than half a day, take them out and let them stand. At the same time, sprinkle some sweet potato powder on the fish pieces and mix well.

4. Step 4: Heat the oil in a hot pot and turn it to medium heat. At the same time, slowly add the fish pieces and fry until the fish pieces are golden brown. Then take them out of the pan and fry. Good fish pieces and even the fish bones are crispy and can be chewed and eaten directly.