Silkworm vegetables, that is, gurgling vegetables, also known as Vietnamese spinach and auricularia auricula, are scientifically called sunflower seeds. Cantonese call it greedy vegetable, which is a perennial herb of Malvaceae. It has a straight root system. The succulent stems are 3-4 meters long and have strong branching ability, which can produce more than 10 branches. Leaves alternate, entire, ovoid, slightly pointed at the apex, smooth and glabrous. The maximum length and width of leaves is 12x 13cm, and the branches and leaves are small.

When you eat it, you pick the stems and leaves near the stems, which is a bit like kale and green. The leaves are big, alternate, heart-shaped, 8-15cm long, 9-16cm wide and 0.2cm thick, with plump, smooth, hairless and short stalks. Bulbs can grow in leaf axils, which are 2-4cm long and 1-3cm wide, and their tender leaves and buds are soft. In Song Dynasty, Su Dongpo praised him as "an enemy". "Guangdong Newspeak" said that it was "the rattan leaves are smooth and edible, and the taste is slightly sour, so it is appropriate to use soup fish". But people think it is too mushy (mucus) and call it "gurgling dish". In the cooking practice, Guangdong folk have found a way to keep the vegetables from purring, and the clear soup of the vegetables with purring is a good soup made by this side. Sweet and soft, it has the functions of clearing heat, promoting diuresis, moistening intestines and relaxing bowels. It's a delicious family soup in midsummer. A person who is not fit, empty and afraid of cold. But if it is used to make soup and cooked for a long time, it can greatly reduce the coldness. People who are not healthy are not afraid to drink, but don't drink too much. Corrugated vegetables contain a lot of cellulose, iron and fiber. It can clear stomach, facilitate defecation and prevent damp-heat diarrhea.