Teriyaki Chicken Onigiri is a savory and flavorful variation of Onigiri that combines the sweetness of teriyaki sauce with tender chicken. To make Teriyaki Chicken Onigiri, start by marinating chicken breast in a mixture of soy sauce, mirin, sugar, and ginger. Let the chicken marinate for at least 30 minutes to allow the flavors to develop. Grill or pan-fry the chicken until it is cooked through and then slice it into small pieces. In a separate bowl, mix the sliced chicken with teriyaki sauce until it is well coated. Take a small portion of sushi rice and flatten it in your hand. Place a spoonful of the teriyaki chicken mixture in the center and shape the rice into a ball or triangle. Repeat the process until all the rice and filling are used. Teriyaki Chicken Onigiri is a delicious and satisfying dinner option that combines the flavors of teriyaki and chicken in a convenient rice ball form.