Convenience stores all across Japan sell wrapped sushi called onigiri (ăă«ăă), or also known as rice ball. They are made from white rice formed into triangular or cylindrical shapes and often wrapped in nori (seaweed) with various fillings and flavours avaliable.
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Despite common misconceptions, onigiri is not a form of sushi and should not be confused with the type of sushi called nigirizushi or simply nigiri. Onigiri is made with plain rice (sometimes lightly salted), while sushi is made of rice with vinegar, sugar and salt. Onigiri makes rice portable and easy to eat as well as preserving it, while sushi originated as a way of preserving fish.