Literally, ash means Peng ash. An edible alkali extracted from plants endemic to Lanzhou. Beans are peas. Edible alkali pea soup. Adding alkali softens the beans and makes the soup have an unspeakable fragrance, which is not sweet but not bitter. It's a taste in between. Coupled with the soft sand and jujube fragrance of beans, beans have not completely turned into bean paste, which is too boring. There will be a slightly hard chewing feeling, and the sweet bean fragrance will be emitted from it.

In ancient times, there was a rough casserole sitting on a coal stove. The pot was always filled with black and purple rotten porridge, and a spoonful of muddy and dense gray beans was scooped in a rough gravel sand bowl. If you drink standing or squatting, the temperature of the gray beans will not burn your mouth. It's warm, just the acceptable temperature for your mouth, and it won't burn or get cold. Wives who have seen plays and played cards before will order snacks or snacks. It must be the gray beans in the food stall with dim kerosene lamps on the corner.