Katsuo Nigiri is a type of sushi made with bonito. To make Katsuo Nigiri, you will need the following ingredients: sushi rice, bonito fillets, soy sauce, wasabi, and pickled ginger. First, prepare the sushi rice by washing and cooking it according to the package instructions. Once the rice is cooked, let it cool slightly. Then, slice the bonito fillets into thin pieces. Take a small handful of sushi rice and shape it into a rectangular shape. Place a slice of bonito on top of the rice and gently press it to secure it. Serve the Katsuo Nigiri with soy sauce, wasabi, and pickled ginger on the side. This sushi dish is a delicious and refreshing way to enjoy bonito.