Katsuo Tempura is a crispy and delicious dish made with battered and deep-fried bonito. To make Katsuo Tempura, you will need the following ingredients: bonito fillets, tempura batter mix, ice-cold water, vegetable oil for frying, and dipping sauce. First, prepare the tempura batter by mixing the tempura batter mix with ice-cold water according to the package instructions. Heat the vegetable oil in a deep fryer or a large pot to 350°F (175°C). Dip the bonito fillets into the tempura batter and carefully place them into the hot oil. Fry the bonito fillets for about 2-3 minutes until they turn golden brown and crispy. Remove the fillets from the oil and drain them on a paper towel. Serve the Katsuo Tempura with a side of dipping sauce. This dish is a popular choice for tempura lovers who enjoy the combination of crispy batter and tender bonito.