1, Snow Swallow is the pulp secretion of the genus Lepidoptera, and it is called "Snow Bird's Nest" because its hair is similar to bird's nest. Snow Weirs are mainly grown in Myanmar and China, and there are a few in Vietnam.

2. Snow weir is edible. The soaking time of the snow weir is 30-50 times. When eating, each person takes 3 grams each time, soaks in clear water for 6 hours, washes with clear water for 3 times, picks out impurities such as bark with tweezers, and stews in a stew pot for 30 minutes. Don't stew for more than 1 hour, the snow swallow will turn into water.

3. Snow weir can inhibit the absorption of sucrose, reduce the increase of blood sugar, improve type 2 diabetes, and prevent obesity, hypertension and hyperlipidemia. Therefore, it is expensive and is praised as delicious by health care people.