In early ancient times, vinegar was called "Qiang", and "Guang Yun" contained: "Qiang, pulp, vinegar." There is an article "Cooking Method" in Qi Shu Yao Min, which introduces the production technology of vinegar. According to legend, the inventor of vinegar is Du Kang, a wine-making expert. Vinegar is just a by-product of wine. It is said that Du Kang originally discarded the distiller's grains after brewing as waste. It's a pity that more and more people are discarded after a long time. I hope I can use it again! So I piled the distiller's grains in a big jar and tried to seal it with water. After 2 1 day, the smell in the jar began to appear. When he opened the jar and tasted the bad juice, it was sour and sweet, so he put it in another jar and called it "sauce". Then I tried to sell the sauce, which was unexpectedly popular. Later, when the business grew, Du Kang wanted to give it a name. Thinking that this sauce was discovered at 2 1 day unitary time, he combined unitary and miserable one day and named it "vinegar". Since then, the production method of vinegar has spread, and its seasoning function has also expanded to all parts of the country. China is a country of poetry, and the ancients wrote poetry to reflect the world and emotions. How many "vinegar poems" appeared in ancient poetry reflects ancient jealousy. "Bud ginger purple vinegar baked whitebait, snow bowl with more than two feet. There are peach blossoms in spring, and the meat tastes better than squid. " This is "vinegar-boiled poem", with whitebait and ginger and purple vinegar, which is good in color, fragrance and taste. There is also "a little salt to help the taste, a little Jiang Guifa spirit." Acyl is vinegar, which is put in the saucer. This "vinegar poem" reflects the custom of dipping in vinegar in ancient restaurants. According to research, the word "vinegar" was recorded in the Tang Dynasty. A book in one's hand and in one's hand in the Tang Dynasty tells a story: Mrs. Fang, the prime minister, was very jealous. Emperor Taizong planned to give several beautiful women in the room as concubines, but she never dared to use the house. Knowing that Mrs. Fang was determined not to allow it, Emperor Taizong asked Mrs. Fang to order that "I would rather live than be jealous, but I would be jealous if I didn't die" and prepared a pot of "poisoned wine" for her. Not afraid, Mrs. Fang took the "poisoned wine" on the spot and gulped it down to show that she would rather die than be jealous. In fact, what Emperor Taizong gave her was just a pot of vinegar. Emperor Taizong played a joke on Mrs Fang. So there is an allusion to "jealousy". The word "jealousy and jealousy" has also been passed down to this day. It is said that there was a rich man in the Ming Dynasty who insisted on concubinage despite his wife's repeated persuasion. On the wedding day, his wife was familiar with poetry and prose, so she wrote a poem to congratulate him: "Congratulations to Lang Jun for having her again. I'm quitting now. When you open the door, you will be given everything, with rice, oil and salt sauce and fragrant tea. " I sent six of the seven things about housework, and I didn't mention vinegar. This is congratulations, but this is vinegar. To express inner dissatisfaction, there is no deep meaning. Tea with rice, oil, salt, sauce and vinegar is a daily necessity for people in ancient and modern times, commonly known as "seven things to open the door" According to the examination, it began in the Song Dynasty and became in the Yuan Dynasty. According to Liang Lumeng in Song Dynasty, there are eight things: firewood, rice, oil, salt, wine, sauce, vinegar and tea. This was said before the Song Dynasty. In the Yuan Dynasty, "wine" was removed and turned into seven things, which have been passed down to this day. It can be seen that the ancients regarded vinegar as more important than wine, but wine was an indispensable sacred product in ancient sacrifices and banquets. It can be concluded that in life, the ancients put vinegar above wine and tea, which is insightful and of social significance. Since then, seven things have entered poetry, which is full of historical records of past dynasties. It can be said that it is a bow in ancient poetry books. As one of the seven wonders, vinegar first appeared in Yuan Dynasty's zaju. In "Liu Xingshou", the second compromise cloud: "Teach you to be a master, not a master, until you are in a mess; There are always seven things that open the door, rice, oil, salt, sauce, vinegar and tea. " This is a "poem about being a master", which warns people to live within their means and manage their homes diligently. In ancient times, not only ordinary people worked hard for seven things all the year round, but also literati worried about seven things. Tang Bohu, a gifted scholar in the Ming Dynasty, wrote in New Year's Eve: "All the rice, oil, salt, sauce, vinegar and tea are in other people's homes. There is nothing to do at the end of the year, and I wish the Tang Temple to see Mei. " This poem "vinegar without poetry" reflects his poor family. He is not worried, but laughs at himself and takes pleasure in suffering. There is also an anonymous poem: "painting, books, piano, chess, poetry and hops were all inseparable from it;" Now seven things have changed, rice, oil, salt, sauce, vinegar and tea. "I don't know in which dynasty this poet looked back: he once lived a comfortable and leisurely life. Today, I have to work hard and endure hardships for my life. Vinegar is sour, rich in Vc and organic acids, and has the effects of promoting fluid production to quench thirst, nourishing yin and replenishing fluid, and also has the health care functions of stopping bleeding, sterilizing and smoothing qi. However, the smell of vinegar is often used in the opposite direction, becoming synonymous with hardship and bitterness. Before liberation, there was a teacher, and the husband and wife lived alone, so it was difficult to make ends meet. They wrote a poem: "open the door seven times and worry about her, rice, oil, salt, vinegar and tea;" "Fortunately, you don't have to buy three flavors, and your stomach is full of bitterness and bitterness." Full of bitterness, heartbreaking.