Remove the skin of the cod fillet, as well as the pinbones, if any.Cut the cod and hanpen into small pieces.
Grind the cod and hanpen in a food processor, blender, suribachi or mortar. Add the rest of the ingredients and mix well.
Divide and shape into 4-5 small patties.
Heat up some vegetable oil to 170 C. Add the patties and deep-fry until golden brown, flipping to cook both sides evenly (about 3-4 minutes per side). Put on a paper towel lined tray to drain off excess oil. Serve with grated ginger and soy sauce.