This fish fillet is ground with a millstone, and sugar, salt, mirin (sweet cooking rice wine) and egg white are added to it and then kneaded together (adding salt causes it to become sticky by itself, but sometimes food additives such as thickening agents are added for easier molding).
この身を石臼などですり潰し、砂糖、塩、みりん、卵白を加えて練り合わせる（本来、塩を加えて練ることで自然に粘り気が生じるのだが、後の整形をしやすくするために増粘安定剤などの食品添加物を加えることもある）。