According to the experiment center of South China Agricultural University, plum contains 5.7% sugar and 5.6% protein, and contains many vitamins, 17 amino acids and 7 trace elements such as zinc, magnesium and potassium. It has the health care effects of resolving food stagnation, invigorating stomach, increasing fat and lowering blood pressure, and has been recognized as "natural healthy food" by the US Food Administration.
According to Hui's records, the production of plum vegetables began in the lower leaves of Ming Dynasty, with a history of more than 400 years. It's a special product of Lingnan, and it's a tribute to Beijing. It's court food, also called "tribute". Hotels in Beijing still retain the Cantonese cuisine menu of "Braised Pork with Plum".
The production season of plum vegetables is winter, and it is usually planted and cultivated before the harvest of late rice. Vegetable seedlings last about one month and are planted after the late rice harvest. Most people choose to grow plum vegetables in rice fields with good water conservancy conditions and automatic irrigation. From the beginning of planting, water every day in the first week, water every two days in the second week, and fertilize at intervals. Prunus mume can be harvested when the growth period is about 80 days and the core grows to 10 ~ 15cm. When harvesting, first cut down the vegetables in the field and dry them for a day, and then use a knife to open the whole dish into a shape with a prominent core and connect them one by one. Sun for another day, then put the vegetables in a cement pool, put a layer of vegetables and a layer of salt, step on them with your feet, and hold them down with big stones. After 3 days, you can take it out and sun it on the grass or sun-dried rice fields. Sun it every morning, collect it at night, and add some salt on the way. When they are 70% dry, they can be eaten golden yellow.
Plum vegetables are divided into three types: core, sliced vegetables and thick leaves, which are sweet and crisp. Among them, the cabbage is tender, yellow and delicious. It can not only cook, but also relieve summer heat. Therefore, in the hot summer or the season when vegetables are green and yellow, people especially like to use plum vegetables as a kind of food.
The most famous practice of plum vegetables is to buckle meat with plum vegetables.
The specific birth of plum vegetables may not be clear at present. Some people use the legend of god to explain the birth of plum cuisine, which is even more nonsense. The specific production of plum cuisine remains to be verified.