The festival culture and food culture of the Tang Dynasty were very developed. It is said that Wu Zetian was fond of flowers. Every year on the Flower Festival, the 15th day of the second lunar month, she would order her palace maids to collect flowers, mash them with rice, steam them into cakes, and use the flower cakes to reward ministers. This kind of cake has the fragrance of petals and grains. It quickly became popular and became extremely popular in the palace.