Yaki onigiri are plain, triangular rice balls (no fillings or nori wrapper) cooked on a hot charcoal grill and brushed with soy sauce or miso. The sauce on the outside caramelizes as the rice becomes charred and crispy and gives off an aroma of popcorn. The interior of the ball heats up and drinks in just a hint of sauce. It is a riot of flavor and texture made with two completely ordinary ingredients.
