Katsuo Donburi is a comforting and satisfying rice bowl dish that features bonito as the star ingredient. To make Katsuo Donburi, gather the following ingredients: bonito flakes, cooked rice, soy sauce, mirin, sugar, ginger, green onions, and nori seaweed. Start by preparing the sauce. In a small saucepan, combine soy sauce, mirin, sugar, grated ginger, and a splash of water. Bring the mixture to a simmer and let it cook for a few minutes until the flavors meld together. In a separate bowl, place a generous amount of cooked rice. Top the rice with bonito flakes and drizzle the sauce over the flakes. Garnish with thinly sliced green onions and nori seaweed. To enjoy the Katsuo Donburi, mix all the ingredients together, ensuring that the bonito flakes are evenly distributed throughout the rice. The combination of the savory sauce, tender bonito flakes, and fluffy rice creates a comforting and flavorful meal. Enjoy!