What is the seasoning knowledge of onion?

Onion is an essential condiment in the kitchen, mainly in the north and mostly in the south.

Allium, Liliaceae, is a perennial herb, 50 cm high, usually clustered; The fibrous roots are tufted and white; The bulb is cylindrical and hollow; The top is pointed and green. It is cultivated all over China and can be used as medicine all over the body.

Onions are spicy and spicy, and are often used for frying and frying; Shallots, also known as chives, have a light taste and are usually eaten raw or mixed with cold dishes. According to legend, after Shennong tasted a hundred herbs and found onions, he used them as condiments in his daily diet, adding onions to reconcile various dishes. So it was called "harmonious grass" in ancient times. Now, there is also a folk saying that "onions are not ripe". Onion can not only be used as seasoning, but also can prevent and treat diseases, which can be described as a good vegetable medicine.

Onion leaves: can dispel wind and sweat, detoxify and reduce swelling, and treat colds, headaches and nasal congestion. Herbal dietotherapy says that onions "cure typhoid fever and strengthen summer heat."

Scallion: pungent and warm. Into the lungs and stomach, it can sweat and detoxify, and promote yang and dampness. Commonly used in clinic: ① common cold, fever and aversion to cold. However, the intensity of sweating with scallion is not enough, so it is mainly used for mild stomach feeling. ② Treating diarrhea and abdominal pain. ③ Treatment of urinary tract obstruction. "Medication for the Heart" says that onions "ventilate yang and disperse wind".

Onion seed: it can warm kidney and improve eyesight, and treat impotence and dizziness. Shennong's Herbal Classic says that onion is "the main eye, the essence is deficiency".

Scallion beard (onion root): can cure wind-cold headache. "A Record of Famous Doctors" said that scallion must "treat typhoid fever and headache".

Scallion is commonly used in traditional Chinese medicine prescriptions. Clinically, it is mainly used to treat wind-cold common cold. Ge Hong, a famous doctor in Jin Dynasty, recorded "onion and soybean soup" in "Elbow Queen", which is a prescription for treating mild cold composed of onion and soybean, and has been in use ever since. Herbal Dietotherapy also records that onions can "kill all fish poisons". Therefore, when cooking fish, adding onions can not only flavor, but also detoxify. "A Brief Introduction to Medical Forest" records that onions "can pass through the whole body, roots and white skin, and those who are green and sharp can reach the muscle surface and go up to the head. It's unprofessional to use it again. Keep it when you are familiar with it. " Onions also have the function of promoting lactation. Compendium of Materia Medica records that onions "promote lactation".

Onions contain volatile oil, which has a pungent smell. When used in cooking, it can remove the fishy smell in greasy dishes, produce special aroma, stimulate the secretion of digestive juice and stimulate appetite.

It also contains "prostaglandin A", which has the functions of relaxing small blood vessels, promoting blood circulation and improving the function of nervous system, helping to prevent dizziness caused by high blood pressure, keeping the brain flexible, and playing a certain role in preventing cardiovascular diseases and Alzheimer's disease.

Although the sweating effect of onion is not very strong, it is not suitable for patients with cold and sweating. "Herbal Shu Shu" says that "those who are prone to sweating due to exterior deficiency should not eat, and those who have sweated should not re-enter".

According to modern research, onion leaves contain glucose, fructose and so on. Onion oil contains allicin and vitamins C, B and B2. Pharmacological experiments show that scallion can stimulate sweat glands and have sweating effect; Can promote the secretion of gastric juice, and has the function of invigorating stomach; Scallion also has expectorant effect.

Onion itself is also rich in vitamins and minerals, which has a certain nutritional and health care function. The volatile capsaicin contained in it has strong bactericidal ability. When capsaicin is excreted from the body through sweat glands, respiratory tract and urinary system, it can slightly stimulate the secretion of related glands, and play a role in sweating, eliminating phlegm and diuresis, thus improving the body's resistance and preventing respiratory infectious diseases.

People who often eat onions, even if they are fat, will not increase cholesterol and be strong.

Onion contains trace element selenium, which can reduce the content of nitrite in gastric juice and play a certain role in preventing gastric cancer and various cancers.

Health tips can be eaten by ordinary people, especially mental workers.

Hyperhidrosis, body odor, eye diseases, gastrointestinal diseases, especially ulcer patients are not suitable for eating.

Onions have a strong stimulating effect on sweat glands. People with underarm odor should eat carefully in summer, and people who sweat too much should avoid eating.

Don't eat too much, otherwise it will cause dizziness, blurred vision and damage your vision.

Onions should not be eaten with honey.

Onion leaves are rich in carotene, so don't throw them away easily.

After eating onions, people will leave an unpleasant smell of onions in their mouths. At this time, just rinse your mouth with strong tea or chew a few pieces of tea in your mouth to get rid of this taste.

Good quality onions should be white and long, strong and even, with green leaves, no pests and no dead leaves. Onions should be tied up with their roots down and stored in a cool and ventilated place for a short time. Onions have strong cold resistance and are not afraid of freezing.