Tuna Mayo Onigiri is a popular variation of the classic Japanese rice ball dish. It is made with Japanese short-grain rice, canned tuna, mayonnaise, and salt. To make Tuna Mayo Onigiri, start by cooking the rice and letting it cool slightly. In a separate bowl, mix the canned tuna with mayonnaise and salt to taste. Wet your hands with water and sprinkle some salt on them. Take a small handful of rice and shape it into a triangle or oval shape. Make a small indentation in the center of the rice ball and place a spoonful of the tuna mayo mixture in it. Cover the filling with more rice and shape it into a ball or triangle. Repeat the process with the remaining rice and filling. Tuna Mayo Onigiri is a delicious and creamy variation of the classic onigiri. The combination of the savory tuna, creamy mayonnaise, and fluffy rice creates a satisfying and flavorful snack. It is perfect for picnics, lunchboxes, or as a quick and easy meal.