In ancient China, during the Cold Food Festival, people would not light a fire to cook and only eat cold food. Cold food is food that is prepared in advance and does not need to be heated. Artemisia cake is a snack in southern Anhui and is named after its color. It is made by mixing the juice of a type of mugwort that only appeared around the Qingming Festival into the proportioned glutinous rice/sticky rice/flour, kneading it evenly by hand, and then wrapping it with different fillings according to everyone's preferences and steaming it.

There are similar traditional pastries in other parts of China. The production methods and eating customs are similar to those of Qingtuan. They are all made from glutinous/sticky rice before and after the Qingming Festival. It is called "Ai Guo" in the Hakka area of ??Guangdong and Taiwan [1-2], "Ai Guo" in the Hakka area of ??Jiangxi Province, "Ai Guo" in southern Fujian and Chaoshan areas, and often called "Ai Guo" in the Guangfu area. Ai Cake"[3]. The prepared green dumplings taste sweet, soft and glutinous, with the aroma of mugwort leaves.