Tuna Mayo Onigiri is a delicious variation of the classic 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 previous recipe. In a separate bowl, mix canned tuna with mayonnaise and any additional seasonings such as soy sauce or sesame oil. 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. Repeat the process until all the rice and filling are used. Tuna Mayo Onigiri can be enjoyed as a standalone dish or as part of a bento box. It is a great option for a quick and satisfying dinner.