Tuna Mayo Onigiri is a popular variation of onigiri that combines the creaminess of mayonnaise with the savory taste of tuna. To make this delicious onigiri, you will need cooked Japanese short-grain rice, canned tuna, mayonnaise, salt, and nori seaweed. Start by draining the canned tuna and mixing it with mayonnaise in a bowl. Season the mixture with a pinch of salt to taste. Wet your hands with water to prevent sticking, then 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 and add a spoonful of the tuna mayo mixture. Cover the filling with more rice and shape it into a ball or triangle, ensuring the filling is completely enclosed. Repeat the process with the remaining rice and filling. Finally, wrap each onigiri with a sheet of nori seaweed for added flavor and presentation. Tuna Mayo Onigiri is a delicious and satisfying option for a quick lunch or snack.