How did the ancient ingredients keep fresh? Is the litchi eaten by Yang Guifei still fresh?

In ancient times, Yang Guifei also had ice rooms and things like that, as well as cellars to keep fresh. The lychee eaten by the princess was of course fresh! If it's not fresh, how can Princess Yang Cangui like litchi so much? After all, stale litchi tastes strange. Speaking of litchi, it's really expensive. Even today, when the express delivery technology is quite developed, it is not easy to transport litchi from the south to the north. If it is not well preserved, the litchi delivered can't be eaten at all.

It is said that Yang Guifei of the Tang Dynasty liked litchi very much. Therefore, if you want to transport litchi from Lingnan to the capital of the Tang Dynasty, you have to rack your brains to find a way, but even so, litchi will still go bad. It turned out that the litchi that Yang Guifei ate was actually from Sichuan. In this way, the distance can be slightly shortened. However, even so, at that time, a lot of manpower, material resources and financial resources were spent, and a litchi road was specially built for Yang Guifei's litchi to facilitate people to send litchi to Beijing quickly. What's even more frightening is that they also used urgent transportation that only military aircraft can use.

No matter how many people and horses will be exhausted in the process, it is actually very difficult to keep litchi fresh even if urgent technology is used. So there are smart people who use sealed preservation technology. They cut litchi directly with branches and leaves, which can ensure the freshness of litchi in a certain period of time. Then put litchi in bamboo, paste mud on the mouth of bamboo and keep it fresh. In this way, litchi will not go bad when it is sent to Chang' an.

And ordinary people don't have so much trouble, running so far to transport litchi to eat. Ordinary people want to keep the ingredients fresh at home, so they dig a big cellar at home and use the temperature difference between the ground and the ground to keep the ingredients fresh. In addition, even now, some rural families have cellars.