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Wash clean the scaled fish, make sure to remove the black membrane inside, cut off the fins. Place the fish on a cutting board, remove the head. While firmly pressuring the fish with one hand, place the blade as close to the bone as possible, slice the fish horizontally crosswise until the whole fillet is off, and remove the fin and belly flap. Slant cut the fish into slices. Note: don't cut the fish slices too thin to prevent breaking.