Tuna Mayo Onigiri is a popular variation of the classic Japanese rice ball. To make this recipe, you will need sushi rice, canned tuna, mayonnaise, soy sauce, and salt. Start by cooking the sushi rice in a Thermomix according to the manufacturer's instructions. While the rice is cooking, prepare the tuna mayo filling by mixing canned tuna, mayonnaise, soy sauce, and a pinch of salt in a bowl. Once the rice is cooked, let it cool slightly before shaping it into small triangular or round balls. Wet your hands with water to prevent the rice from sticking. Make a small indentation in the center of each rice ball and add a spoonful of the tuna mayo filling. Gently close the rice ball, making sure the filling is completely enclosed. Tuna Mayo Onigiri is a delicious and convenient snack that combines the creaminess of mayonnaise with the savory taste of tuna. It is perfect for a quick lunch or a picnic treat!