According to legend, in Chu, people have headaches because of wind and rain. On the third day of March, Shennong passed Yunmengze and saw that the villagers had a terrible headache. He found wild eggs and vegetables and cooked them to satisfy people's hunger. People eat their heads and the pain stops. The custom of "eating vegetables and boiling eggs on March 3, a year without headaches" 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. Cauliflower is in full bloom in March of the lunar calendar every year. Every year in the third month of the lunar calendar, everyone collects cauliflower and cooks eggs to eat. Over time, it has become a custom. In order to make it easy to remember and pass on this good tradition, people set the third day of March as cauliflower eating day.

Eating cauliflower and boiled eggs on March 3 is not only in Hunan, but also in the south, middle and north-central regions.