Vegetable Onigiri is a vegetarian-friendly variation of Onigiri that is filled with a variety of vegetables. To make Vegetable Onigiri, start by sautéing your favorite vegetables such as carrots, mushrooms, and spinach in a pan with some oil and soy sauce. Let the vegetables cool slightly before using them as the filling for the Onigiri. Prepare the sushi rice and shape it into small triangular or round balls. Place a spoonful of the sautéed vegetables in the center of each rice ball and shape it into a triangle or round shape. Finally, wrap the Onigiri with a strip of nori seaweed. Vegetable Onigiri is a healthy and flavorful snack that is perfect for those following a vegetarian or vegan diet.