Onigiri (お握り or 御握り; おにぎり), also known as omusubi (お結び; おむすび) or rice ball, is a Japanese food made from white rice formed into triangular or oval shapes and often wrapped in nori (seaweed).
Traditionally, an onigiri is filled with pickled ume (umeboshi), salted salmon, katsuobushi, kombu, tarako, or any other salty or sour ingredient as a natural preservative. The filling should not be juicy, otherwise it may run through the rise causing it to break up.
The rice balls are easy to prepare. The key to cook good Onigiri is to use freshly-cooked rice. Onigiri aren't that good when prepared with cold rice.
Onigiri are easy to carry, that's why they are extremely famous for carry-along lunches. This dish can be served by itself or be a component of a bento or boxed lunch.
Because of the popularity of onigiri in Japan, most convenience stores stock their onigiri with various fillings and flavors. There are even specialized shops whose only products are onigiri for take out. Outside of Japan, Onigiri became popular only recently.
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Onigiri (rice balls), www.justhungry.com