Begin by rinsing the sushi rice: Place it in a fine mesh strainer and run cold water over it, gently stirring with your hand until the water runs clear.
Cook the rice by combining it with 2 ½ cups of water in a rice cooker. Alternatively, you can use a pot on the stove, following the package instructions. Once cooked, let the rice cool slightly.
While the rice is cooling, prepare the chicken filling: In a medium-sized bowl, combine the shredded cooked chicken with soy sauce, sesame oil, mirin (if using), and salt. Mix well and set aside to allow the flavors to meld for about 10 minutes.
After the rice has cooled to a manageable temperature, dampen your hands with water to prevent sticking. Take approximately 1/3 cup of rice and shape it into a ball.
Using your fingers, create a small indentation in the center of the rice ball. Spoon a generous amount of the marinated chicken mixture into this indentation.
Carefully mold the rice around the filling, shaping it into a triangle. Be sure to press the rice together gently but firmly to secure the filling. Repeat this process until all of the rice and chicken mixture has been used.
Once shaped, sprinkle furikake over each onigiri for an added burst of flavor. Wrap a strip of nori around the bottom of each triangle for easy handling and a delightful taste contrast.
For a finishing touch, sprinkle chopped green onion over the top of the onigiri to enhance the presentation and flavor.
Notes
Showcase the onigiri on a vibrant plate with extra nori strips or sesame seeds for a pop of color.
Keyword chicken, Japanese cuisine, onigiri, rice balls