Hot and sour vermicelli. It cannot be boiled directly with boiling water alone. It is best to soak the vermicelli in warm water first, so that the vermicelli can fully absorb water and become soft (can be easily pinched off by hand), then scald it in boiling water before eating. If cooked for a long time, the vermicelli will turn into small short sections and eventually A slight mushy soup phenomenon occurs (this is because soluble starch melts at high temperatures).