Katsuo Nigiri is a type of sushi made with bonito fish. To make this dish, you will need the following ingredients: bonito fillets, sushi rice, nori seaweed, wasabi, and soy sauce. First, prepare the sushi rice by washing and cooking the rice according to package instructions. Once the rice is cooked, let it cool slightly and season it with a mixture of rice vinegar, sugar, and salt. 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 wrap it with a strip of nori seaweed. Repeat this process with the remaining ingredients. Serve the Katsuo Nigiri with a side of soy sauce and wasabi. Katsuo Nigiri is a classic sushi dish that highlights the delicate flavor and texture of bonito fish.