Han folk customs. Popular in Hangzhou and other places. In May of the lunar calendar, Hangzhou people call it May Yellow Moon, which is named because there are five kinds of food with "yellow" sounds on the market. On the Dragon Boat Festival, people in Hangzhou must eat realgar wine (mixed with realgar and soju, cut the roots of calamus and drink a little), yellow croaker, cucumber, salted duck egg yolk and rice dumplings wrapped in beans, which is called "eating Huang Wu".

In the tradition of Jiangnan people, they eat "Huang Wu" on the Dragon Boat Festival-Monopterus albus, yellow croaker, cucumber, salted egg yolk and realgar wine (realgar is poisonous, and ordinary rice wine is generally used instead of realgar wine).

At noon on the Dragon Boat Festival, the most suitable meal for Huang Wu is to mix five kinds of yellow food. Because the theory of traditional Chinese medicine holds that the Dragon Boat Festival is on the fifth day of the fifth lunar month, which is the peak of yang in a year, and noon is the peak of yang in a day, we can use the power of the solar terms of the Dragon Boat Festival to curb bad luck and enhance our energy.