Besides, sushi is a traditional food in Japan. In ancient Japan, sushi was salted fish marinated with salt and rice, which evolved into sushi today. "Sushi" was written as "_" (すし) in ancient Japan, which originally meant "salted fish". The name "Sushi" is the pen name of the word "_".
And the Japanese often say "where there is fish, there is sushi". This kind of food is said to come from subtropical coastal and island areas. People there found that if the cooked rice was put in a clean fish room and buried in the altar, it could be preserved for a long time, and the food would have a slightly sour taste because of fermentation, which was the embryonic form of sushi.