Vermicelli is made from the starch of potato or sweet potato. Potato flour in Northeast China is the best, especially potatoes in Heilongjiang Province. The production of sweet potato powder is of course good in the south.

But no matter where it is, there are a few illegal counterfeiters who adulterate it. When it is cooked in a pot, it becomes porridge. Good vermicelli can withstand cooking, and the more it is cooked, the stronger it becomes.

Longkou's fine vermicelli is very famous, sweet potato powder has some sweetness, and the best meal for coarse powder or wide powder is northeast potato powder.