Sour plum soup has a thousand years of history and is one of the oldest traditional beverages in China.
Dragon Beard Sugar was originally called Yinsitang (also known as Dragon Beard Crisp, Noodle Sugar). The raw material is maltose. It is a traditional Chinese folk snack.
The easiest way to eat it is to have wooden sticks covered with maltose gum. In the mid-nineteenth century, Western biscuits were introduced to China, and maltose was eaten in the middle of the biscuits.
This should be a famous street snack that has experienced dynasties. In ancient hutongs, many novels and essays are mentioned.