Mainly for the purpose of sacrificing ancestors. April 5th of the Gregorian calendar is one of the traditional festivals in Tomb-Sweeping Day, and one of the popular customs in Tomb-Sweeping Day is to have a reunion dinner. This custom can be traced back to the Zhou Dynasty more than two thousand years ago. According to Zhou Li, there was a law that "Muduo was forbidden to follow fire in mid-spring", so people cooked with guns and "ate cold food for three days".

During the cold food period, that is, one or two days before the name is not named, it is also designated as the "Cold Day". Before and after Qingming, it is the best season to pick Qingming grass. At this time, people sacrificed their ancestors by eating pure fruit. The traditional foods of the ancient Cold Food Festival include glutinous rice cheese, wheat cheese, almond cheese, etc. You can prepare for the Cold Food Festival in advance, and you don't need to make a fire to cook.

Nowadays, some dumplings are made of green wormwood, and some are made of Bromus inermis juice and glutinous rice flour, stuffed with bean paste. It has been circulated for more than a hundred years, and it is still an old face. People use it to pay homage to their ancestors, but it is more important to try new things, and the function of the Youth League as a sacrifice is weakening day by day. Epidemic areas of eating youth league: Zhejiang Province, a small part of Fujian Province, Jiangxi Province and parts of Anhui Province.