The original food preservation methods five share how to preserve cooked food in ancient times

1, the ancient refrigerator "Iceman". According to historical records, as early as the Western Zhou period, the court has appeared, specializing in chiseling ice institutions and personnel. They chiseled the frozen river ice into ice cubes in winter, and then stored in the ice cellar. The Zhou Emperor, who lived in the palace, could then use the ice to cool down in the summer time. The container that could be used to cool down the temperature was actually the "Ice Jardin", which was used for storing food.

2, warehouse storage. "Cangcang" is a building can be stored items, built on the ground level above can be called "warehouse", and dug deep in the ground is "cellar". People living in the Tang Dynasty often put their excess grain, vegetables and fruits, as well as agricultural tools and loose articles into the "Cangjiao". Since the temperature in the "warehouse" was much lower than outside, storing food in the "warehouse" could not only prolong its shelf life but also preserve its freshness.

3, high-temperature cooking method. High-temperature steaming method of food storage, as early as 3,000 years ago in the Western Zhou time, in fact, has been widely used. We are familiar with the dried vegetables, pickles and other vegetables, is actually the use of high-temperature steaming method, the food will be cooked and then dried or pickled. This method can make the food shelf life longer, but it can not guarantee the freshness of the food.

4, salt _ preservation. The use of salt preservation and freshness, before the Tang Dynasty has appeared, only in the Tang Dynasty period has been vigorously developed. People would clean the meat and control the water, and then put it into an altar with a relatively small mouth. And add a lot of salt to the altar and seal the mouth of the altar with a cloth.

This method not only prevents the meat from spoiling, but also maintains the flavor to a certain extent. This method mainly utilizes the high permeability of salt, which reduces water activity when it enters the meat, so that it can effectively inhibit bacterial reproduction. The bacon that we all love to eat in modern society is actually made with this ancient method.

5, oil seal antiseptic. As early as the Tang Dynasty period, people learned the oil seal method, in short, is to place the food in the oil. This effectively isolates the air and creates a protective film when the food cannot come into contact with the air.

In general, foods such as meat, eggs, and fish are ideal for storage in oil. To do this, place the food in a jar and pour oil into the jar. The opening can then be sealed with wax. The maximum shelf life when stored in the "oil sealing method" can be up to half a year.