2. Sweet potato vermicelli, commonly known as sweet potato vermicelli, also known as sweet potato vermicelli and vermicelli, is a traditional famous product with a history of more than 400 years. Sweet potato vermicelli is not rotten after being cooked for a long time, fragrant and delicious, and can be eaten in various ways. It is a kind of food made from sweet potato and starch in sweet potato.

Sweet potato vermicelli is an easy-going food, which can be matched with many foods and cooked in many ways to make various dishes.

The color difference between sweet potato vermicelli and vermicelli is still obvious. According to experience, the yellow and blue vermicelli of pure sweet potato are all true, and there is also a kind of white and transparent vermicelli that is true. It is not only black vermicelli that everyone thinks is true. This is actually a misunderstanding. The master who makes handmade vermicelli said that this has a lot to do with the quality of sweet potato vermicelli. In the process of making sweet potato starch, there will be something called "dry powder", which floats on sweet potato starch and is not easy to clean. If there is a lot of "dry powder" in sweet potato starch, the color of vermicelli will turn black. Old people who make vermicelli in rural areas are reluctant to throw away the "dry powder strips" and deliberately mix them in. Over time, people think that only black vermicelli is true. Sweet potato vermicelli is wide, thin and nutritious. Like sweet potato, it is an anti-cancer food. Suitable for boiling, frying and cold salad.

The reason why sweet potato vermicelli is brown is simple. Such as fresh sweet potatoes and apples. It was white at first after being cut with a knife, and it was oxidized to brown after being left in the air for a period of time. The discoloration of sweet potato vermicelli is also the reason. Under normal circumstances, vermicelli will gradually turn white after being cooked, just like the color recovery of discolored apples after being bleached with boiling water.

Generally, sweet potato vermicelli should be boiled in boiling water 15 to 30 minutes, and thicker vermicelli can be boiled for 40 minutes. If you continue to cook, the water absorption of vermicelli will increase, and the taste strength will decrease, resulting in local bursting and increased water-soluble solids. If you continue to cook, the vermicelli will become small knots, and eventually there will be a slight soup paste phenomenon due to the high temperature melting of soluble starch.

Third, the nutritional value of sweet potato vermicelli:

1, vermicelli is rich in carbohydrates, dietary fiber, protein, nicotinic acid and minerals such as calcium, magnesium, iron, potassium, phosphorus and sodium;

2, vermicelli has a good flavor, it can absorb the taste of all kinds of delicious soup, and vermicelli itself is soft and smooth, more refreshing and pleasant. Real green vermicelli has most of the health functions of sweet potato.

Four, sweet potato, scientific name: sweet potato, also known as sweet potato, red taro, sweet potato, sweet potato, sweet potato (north), sweet potato (many places), sweet potato, Zhu potato, pillow potato, Pan Ge, sweet potato, fennel sweet potato, sweet potato.

Sweet potato belongs to the family Convolvulaceae of the genus Panicum, which is more than 2 meters long and lies on the ground. Its leaves are usually wide oval, 4- 13 cm long and 3- 13 cm wide. Corolla pink, white, lavender or purple, bell-shaped or funnel-shaped, 3-4 cm long, and capsule ovoid or oblate.

Sweet potato is rich in protein, starch, pectin, cellulose, amino acids, vitamins and various minerals, and has the reputation of "longevity food". The sugar content reached 15%-20%. Has anticancer, heart protecting, emphysema and diabetes preventing, and weight reducing effects. Li Shizhen's Compendium of Materia Medica in Ming Dynasty recorded that "sweet potato can tonify deficiency, strengthen spleen and stimulate appetite, and strengthen kidney yin", and said that people in the sea can eat for a long time. Chinese medicine regards sweet potato as a good medicine.