Daily life is often inseparable from onion and ginger. Onion has the effect of dispersing wind and cold, detoxification and sweating. Ginger has the effect of detoxification and antiseptic, sweating and relieving symptoms, warming the lung and stopping vomiting. The two together can enhance the expectorant, sweating and diuretic effects of boiled onion and ginger water, which can treat cold and flu, stuffy nose and runny nose, cough, poor urination and dandruff. Modern pharmacological research has found that onion and ginger water also has anti-pathogenic microbial effects, inhibiting a variety of fungi and bacteria to varying degrees, and also inhibiting the occurrence of stomach cancer. The cooking method of green onion and ginger water is very simple, but the most crucial thing is to cook the white onion together with the beard of the green onion, and when choosing the green onion, choose the big onion to cook the best results.