Onigiri is a simple and tasty Japanese dish that will be an excellent appetizer and will decorate any holiday table. Triangular rice balls with filling are given to children at school, taken to work, or simply eaten on the go. Try onigiri with tuna - the delicate filling combined with unleavened rice and soy sauce acquires a bright taste and makes eating a pleasure! Use round rice; it holds its shape well and does not crumble.