1, raw material: 25g dried Nostoc flagelliforme;

2. Soak Nostoc flagelliforme in cold water for 2 to 3 hours to remove impurities;

3. Wash in water and cook in water for 15 minutes;

4. Soak for another 20 minutes, then you can filter the soup and drink it, cold or hot.

Nostoc flagelliforme, also known as Nostoc flagelliforme, is an algae of Nostoc in Cyanophyta, which is widely distributed in deserts and poor soils all over the world. It is named after its black and slender color, such as human hair, and can be eaten.