Sushi "SUSHI" and "sour" are food pickled in sour. In 200 AD, that is, in the Later Han Dynasty, the food "sushi" began to spread in China. It is explained in the dictionary as a food made of salt, vinegar, rice and fish fibula. During the Song Dynasty, wars were frequent in China, and sushi happened to be the most popular food. There are many kinds of food to satisfy the hunger of refugees, including vegetables, fish, meat, and even shellfish. In 700 AD, that is, the Nara Era, Japanese businessmen who went out to do business introduced sushi to Japan. At that time, the Japanese used some vinegar-pickled rice balls, added some seafood or meat, and pressed them into small pieces. Arranged in a small wooden box as food along the way. It was not until 1700 AD, that is, during the Edo period, that sushi became widely spread in Japan and became a common food.