Teriyaki Chicken Onigiri is a savory and satisfying Japanese rice ball recipe. To make this recipe, you will need the following ingredients: cooked Japanese short-grain rice, boneless chicken thighs, teriyaki sauce, soy sauce, mirin, sugar, salt, and nori seaweed sheets. Start by marinating the chicken thighs in a mixture of teriyaki sauce, soy sauce, mirin, sugar, and salt. Grill or pan-fry the chicken until cooked through, then shred it into small pieces. Season the cooked rice with salt and mix well. Wet your hands with water, then take a handful of rice and shape it into a triangle or oval shape. Make a small indentation in the center and place a spoonful of the shredded teriyaki chicken. Cover the filling with more rice and shape it into a ball or triangle. Wrap the onigiri with a strip of nori seaweed. Teriyaki Chicken Onigiri is a delicious and flavorful option for a quick and easy meal.