
A processed food made from seaweed, an essential for onigiri rice balls and sushi
What is nori seaweed?
Nori (のり in Japanese) is a processed food made from seaweed. It mainly refers to sheets of nori, which are made by cutting seaweed into small pieces, washing it with water, and then straining and drying it like one would with washi paper. Other types include powdered green nori used for okonomiyaki and takoyaki, as well as flakes made by drying rock nori that grows naturally on rocks. There are two types of nori sheets: grilled nori, which is grilled as is, and seasoned nori, which is grilled and seasoned with soy sauce or sugar. Grilled nori is essential for wrapping onigiri rice balls and sushi. Seasoned nori is sold in small cuts and is popular as a side dish for rice.

Storage to prevent food loss
Nori gets moist easily, so store it in an airtight container after opening. It can be stored at room temperature for about one month, in the refrigerator for about 3-4 months, and in the freezer for about six months.
Trivia
Nori seaweed is also eaten in China and Korea, although the taste and shape are different. British nori is a paste-like seaweed called Laverbread, and it is said to be made from the same seaweed used to make nori in Japan.