Sashimi is nothing more than fish, bivalves, vegetables, molluscs and mushrooms, that is to say all ingredients used to prepare sushi, served not with rice, but with fresh seaweeds, wakame and kaiso. These ingredients are sliced in a special manner, depending on the type of fish and its softness. In order to prepare this dish in a correct manner, it is necessary to master the difficult art of the different ways of cutting. Equally important is a knife which should have a long, rectangular blade of 30 centimetres with a flat, angular tip.