I went to Lanzhou to eat a seasoning and put it in steamed buns with flowers or baked thousand-layer cakes. Green flour has a strange smell. Excuse me, what is this?

Sophora alopecuroides, also known as fragrant beans, is one of the indispensable spices for people in northwest China to make pasta. It has a special fragrance, a burnt fragrance, but also a plant fragrance. It is made of dried plants and twisted into green powder. Fresh bitter bean powder is green. Although the bitter bean powder is preserved in sealed package, this flavor is permeable. Over time, the seasoning was surrounded by the taste of bitter beans.