Qinghai milk skin
Qinghai Milk Leather is a rare item.
All foreigners love to eat cheese. It is similar to yogurt fermentation process, but concentration of milk is extremely high. As a rule, 10 kg of milk is used for 1 kg of cheese.
The reason cheese is mentioned is because Qinghai milk skin is commonly known as "dry cheese".
Pour fresh milk into a saucepan, boil it slowly over low heat until bottom of saucepan condenses into lumps, take it out and put it in a cool place to dry.
It's production process is even more milk waste than "wet cheese", so it's very important for nutrition.