According to the folklore of the She nationality, in the second year of Tang Zongzhang, Lei Wanxing, a hero of the She nationality, led the She army to fight against the officers and men, and was besieged in the mountains, when the grain was cut off in the severe winter. She army had to pick barnyard grass fruit to satisfy hunger, so Lei Wanxing led the people down the mountain on the third day of the third lunar month and rushed out of the tight encirclement. From then on, every "March 3", Lei Wanxing always called the soldiers to give a banquet to celebrate the breakthrough victory. He also ordered the soldiers of the She army to pick back the leaves of black barnyard grass, let the military kitchen make "black barnyard grass rice", and let the whole army have a full meal to commemorate it.
The preparation method of this "black rice" is not complicated. Wash the picked leaves of black rice, boil them in clear water, and remove the leaves. Then, soak the glutinous rice in black rice soup for 9 hours, remove it, and put it in a cooking cage for cooking. When cooked, it can be eaten.
The prepared "black rice" is not very beautiful in appearance, and its color is black. However, compared with ordinary glutinous rice, the rice smells delicious, which has a different flavor. In order to commemorate the national hero, the She people have to steam "black rice" every year since March 3, which has become a custom of the She family. In the eastern Fujian, she and Han people live together, people get along well with each other through the ages and get married frequently, so eating "black rice" has become a Qingming food custom shared by all ethnic groups in eastern Fujian.