3 Make fishcake batter
Mash the cooled potatoes. Add the shallots, cod, butter, eggs, grated Parmesan, salt, pepper and 3/5/6 Tbsp of panko bread crumbs to the potatoes. With clean hands, knead until combined. Divide the mixture into 12/18/24 and shape each piece into a patty. Place in the fridge to firm up.