Frozen zongzi should be boiled in cold water 15-20 minutes. Blanch the frozen zongzi in a pot with cold water, and cook it for 15-20 minutes, then serve. It should be noted that a lot of hot air will be generated after cooking, so be careful when opening the lid to prevent steam burns. Zongzi is a kind of food wrapped in glutinous rice and steamed in Zongzi leaves, and it is one of the traditional festival foods of Han nationality in China.