Tuna Mayo Onigiri is a popular variation of Onigiri that combines the flavors of canned tuna and mayonnaise. To make Tuna Mayo Onigiri, start by preparing the sushi rice as mentioned in the Classic Onigiri recipe. Once the rice is ready, mix canned tuna with mayonnaise in a bowl. You can also add other ingredients such as chopped scallions or pickles for extra flavor. Take a small portion of the sushi rice and flatten it in your hand. Place a spoonful of the tuna mayo mixture in the center and shape the rice into a ball or triangle. Wrap the Onigiri with a strip of nori seaweed and it is ready to be enjoyed. Tuna Mayo Onigiri is a delicious and filling snack that is perfect for lunchboxes or picnics. The combination of tuna and mayonnaise creates a creamy and savory filling that pairs well with the rice.