Zongzi is an essential food of the Dragon Boat Festival. It is said that people ate them in the Spring and Autumn Period (770-476 BC). In early times, it was only glutinous rice dumplings wrapped in reed or other plant leaves and tied with colored thread, but now the fillings are more diversified, including jujube and bean paste, fresh meat, and ham and egg yolk. If time permits, people will soak glutinous rice, wash reed leaves and wrap up zongzi themselves. Otherwise, they will go to shops to buy whatever stuff they want. The custom of eating zongzi is now popular in North and South Korea, Japan and Southeast Asian nations.