Steps of making snow swallow:

Soak snow swallow for more than 15 hours, changing the water 2-3 times in the middle to clean out the impurities.

Wash the wolfberries and set aside.

Put an appropriate amount of boiling water into the rock sugar and bring to a boil, then add the snow swallow and cook for about 10 minutes. Do not boil it for too long as it will melt into water. After cooking, add milk and wolfberry. The milk can be boiled and then turned off.

Xueyan is the trade name of the natural gelatinous secretion of the genus Pingmi. It has properties similar to peach gum and is mainly produced in tropical and subtropical areas. For example, the snow swallow produced in Myanmar comes from the secretion of the piebald apple tree, and its trade name is "brushed snow swallow".

The snow swallows produced in Vietnam, Indonesia and other places are the secretions of the downy apple tree. The trade names are "Vietnamese snow swallows, Indonesian snow swallows, Yunnan snow swallows". This plant is popular in China. There is also a small amount of distribution in Yunnan.