1.) Lay the flat fish on the chopping board. Cut around the head with the point of the knife until you reach the lateral line.
2.) Cut down the central lateral line until the knife reaches the rib bones. Then cut along the lateral line as far as the tail.
3.) Bending the flexible blade, sweep the knife smoothly against the bones to remove the flesh. Cutting motion will leave flesh on the bone and affect the presentation of the fillet.
4.) Cut the fillet away from the fins and place it on a tray. Turn the fish round and remove the other fillet in the same manner.