Every year on the third day of the third lunar month, many places in China have the custom of eating boiled eggs. Eggs are often cooked with shepherd's purse. There is a saying that "on March 3, eating vegetables and boiling eggs will keep you from having a headache for a year".

According to legend, in Chu, people have headaches because of wind and rain. On the third day of March, Shennong passed Yunmengze (now Xiaogan) and saw that the villagers had a terrible headache. He found wild eggs and vegetables and cooked them to satisfy people's hunger. When people eat it, their heads don't hurt. The custom of "on March 3, eating ground vegetables and boiling eggs will keep them from having a headache for a year" continues to this day.

Scientific research has proved that cauliflower has a good effect on treating headache and can prevent meningitis. People discovered this effect a long time ago. Every year in the third month of the lunar calendar, the cauliflower is in full bloom. Every year in the third month of the lunar calendar, everyone collects cauliflower and cooks eggs. Over time, it has become a custom. In order to facilitate memory and pass on this good tradition.