I said vinegar, especially Yongchun mature vinegar, which is slightly sweet in acid, mellow in taste and brown and black in color, so it is also called black vinegar. Mixing food with it can make people feel sweet and sour, thus increasing their appetite. It is not only a condiment with excellent texture, but also has the functions of invigorating spleen and stomach, eliminating dampness and sterilizing. Long-term storage will not deteriorate, and the color and taste are better. People in the former residence always keep old vinegar to eat or prevent problems, and also give it as gifts to relatives and friends.

Yongchun vinegar has a long history. It is said that in the summer of Yangchun Lake Villa, Song Jinshi, Dr. Taichang, Dr. Lei Guan and Dr. Qian were admitted to the bachelor's college and became princes. Once the prince got mumps, Zhuang Xia mixed the medicine with the old vinegar sent from his hometown and applied it. It really worked. The story spread to Song Ningzong, where he appreciated and personally tasted Yongchun's old vinegar, which he found sour and fragrant. At that time, Ning was in poor health, with frequent abdominal distension and qi stagnation, and loss of appetite. Physicians tried their best but failed. After listening to Zhuang Xia's introduction and eating Yongchun old vinegar, he turned the corner. From then on, Ningzong Imperial Diet always put a pot of Yongchun mature vinegar, which became famous and became traditional vinegar.

The famous Yongchun old vinegar, the news spread like wildfire. During the Northern Song Dynasty, Yongchun folk had ancestral workshops for brewing mature vinegar, and they wanted to brew vinegar at home. Add old vinegar to new vinegar every year. Anyone who can brew vinegar well is called a lucky and prosperous "blessed family". The production technology of Yongchun mature vinegar is unique. High-quality glutinous rice, high-grade monascus, high-grade black sesame and white sugar are selected as raw materials and carefully brewed according to a certain formula. Yongchun folk rich people brew their own mature vinegar, and people regard Yongchun mature vinegar, Jiu Dihuang and Liuwei Dihuang Pills as the "three treasures" at home. A jar of old vinegar at home is often added over the years and passed down from generation to generation for a hundred years as a symbol of good luck.