Green-bean cake, made around the Dragon Boat Festival, is a traditional summer food that can prune heat. Its materials are mainly boiled green-bean powder, steamed sweet-potato powder, vegetable oil, lard, white sugar, rose, dateplum persimmon, etc. The small glossy stuffed cake is fragrant and delicious and can serve to smooth the urine, allay inflammation and remove toxic materials. There is a custom of eating green-bean cakes on Dragon Boat Festival in urban and rural Suzhou .