Soak Nostoc flagelliforme in warm water for two hours before eating. If it is used to make soup, just cook it for 10 minutes. Nostoc flagelliforme, also known as Gracilaria, Caulis Bambusae, Pink Vegetable, Gracilaria lemaneiformis, Hairy Vegetable, Hairy Vegetable, Big Hair, Hairy Hair, Hairy Ear, Hairy Vegetable, ceramium, and Clean Pool Hair, is a terrestrial algae plant belonging to Nostoc of Nostoc family in Cyanophyta, and its somatic cells are dark blue, which was once called "the richest in Hedong District" by Li Yu.