Before Tomb-Sweeping Day, Hakka people in Guiling had the traditional custom of making "Ai Ai". I once heard grandma say that fresh wormwood is a kind of "evil spirit". If you eat fresh wormwood and cold wormwood in Tomb-Sweeping Day, you can "ward off evil spirits". Years of illness do not invade! Why eat cold food instead of hot food? Of course, there are reasons. Because the day before Qingming Festival is called Cold Food Festival, and Cold Food Festival is the day when people ban fire to sweep graves, because Tomb-Sweeping Day is very close to the Cold Food Festival, gradually, cold food and Qingming will be integrated. The Cold Food Festival has become another name of Tomb-Sweeping Day and a custom of Tomb-Sweeping Day: Tomb-Sweeping Day doesn't use fireworks, but only eats cold food. It is not unreasonable to say "ward off evil spirits", because wormwood itself is a kind of herbal medicine, which has the function of aromatherapy and dampness removal. For the Qingming season, it can really prevent infectious diseases such as colds!

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