Either green lemon or yellow lemon is ok, but green lemon is better. Wash and dry. Poke 3 or 4 holes in the skin with a toothpick to make it easy for salt to penetrate. Put the lemon in a 1 oil-free bottle and add salt. Cover the bottle mouth, seal it and put it in the shade. Marinate for at least three and a half months before eating. If you find that the salt is dissolved, but the salt water can't soak the lemon noodles, you should add more salt. Lemon (scientific name: citrus lemon (L.) Burm. F.), a citrus plant of Rutaceae, also known as lemon fruit, foreign lemon, beneficial mother fruit, etc. Small trees with little or no thorns, dark purple leaves and buds, thick papery leaves, oval or ovoid. Flowers axillary or rarely clustered. The fruit is oval or ovoid, with thick peel, usually rough, lemon yellow, sour to very sour juice, small seeds, ovoid and sharp; Seed coat is smooth, cotyledons are milky white, usually single embryo or multi-embryo. The flowering period is April-May, and the fruiting period is September-165438+1October.

Because of its extremely sour taste, lemon is the favorite food for pregnant women with insufficient liver qi, so it is called beneficial mother fruit or beneficial mother and child. Lemon is rich in citric acid, so it is called "citric acid warehouse". Its juice is crispy and fragrant. Because of its sour taste, it can only be used as a high-grade condiment to prepare drinks, dishes, cosmetics and drugs. In addition, lemon is rich in vitamin C, which can eliminate phlegm and relieve cough, promote fluid production and strengthen the stomach. For bronchitis, whooping cough, loss of appetite, vitamin deficiency, heatstroke and polydipsia, it is the bane of scurvy.