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In page Onigiri:

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From the Kamakura period to the early Edo period, onigiri was used as a quick meal. This made sense as cooks simply had to think about making enough onigiri and did not have to concern themselves with serving. These onigiri were simply balls of rice flavored with salt. Nori did not become widely available until the Genroku era (1688–1704) of the mid-Edo period, when the farming of nori and fashioning it into sheets became widespread.[citation needed]