1. First cut off the fins and fish heads of grass carp, as shown in the following figure:

2. Lay the fish flat with one hand and place the knife horizontally next to the fishbone, as shown in the following figure:

3. Slice the fish on the other side in the same way, and it will look like this after slicing, as shown in the following figure:

4. Put the skin of the sliced fish down, hold the fish in one hand, and cut the fish into fillets about 0.3-0.6 cm thick with a knife;

5. The above is the method of removing thorns from grass carp slices.