Katsuobushi kezuriki (鰹節削り器; かつおぶしけずりき) is a traditional Japanese kitchen utensil, similar to a wood plane or mandoline. It is used to shave katsuobushi, dried blocks of skipjack tuna (katsuo). The technique used to prepare the cooking ingredient is pulling and pushing a block of katsuobushi across the blade in the device in a back-and-forth movement. The resulting shavings are captured in a wooden drawer at the bottom of the instrument and retrieved by opening and emptying the shavings that are roughly sorted into two sizes for different uses.