Ginger doesn't need to be peeled. It can be directly shredded or chopped into powder, or it can be sliced and boiled in water for about 15 minutes, then some cola or brown sugar is added and boiled for another 5 minutes. Ginger soup can be drunk when it is aired to be warm. Be careful not to drink frozen or cold ginger soup, which is not effective. Ginger soup can not only be used for adjuvant treatment of colds caused by wind-cold, but also has the effect of preventing colds. Because it has the functions of dispelling cold and dissipating heat, it can be used for the prevention of air-conditioning diseases.