Onion, alias: chive, onion, fire onion, four-season onion, polished rice onion. Allium belongs to Liliaceae and is a perennial herb. Onion stems and leaves, the upper part is blue onion leaves, and the lower part is white onion white. Originally from Siberia, China has a long history of cultivation and is widely distributed, with Shandong, Hebei, Henan and other provinces as important producing areas. According to the length of onion, it is divided into two kinds: scallion and shallot. Onion plants are tall, white and sweet, and cultivated in the north. Onions are a necessity in the daily kitchen. It can not only be used as a condiment, but also prevent and cure epidemics. It can be described as a good plant medicine, which is mostly used for frying. South China produces more onions, which is a common seasoning, also called chives, and is usually eaten raw or mixed with cold dishes.
Onion, a kind of onion, is pungent and warm in nature, and has the functions of releasing yang, detoxifying and seasoning. Mainly used for wind-cold common cold, aversion to cold and fever, headache and nasal congestion, abdominal pain due to yin cold, dysentery and diarrhea, internal resistance of insect accumulation, milk obstruction, and unfavorable stool. Onion contains volatile oil, mainly allicin, and also contains diene sulfide and calcium oxalate. In addition, it also contains fat, sugar, carotene, vitamins B, C, nicotinic acid, calcium, magnesium, iron and so on. People suffering from gastrointestinal diseases, especially peptic ulcer, should not eat more.