A old women tests quality of corn wine before buy it in Yen Minh fair, Ha Giang, Viet Nam. Mading and using corn wine is a tradition of H'mong people in Vietnam. In there, when you come in a H'mong house, they treat you by corn wine, not water or green tea like Kinh people or other group. And at least 2 cups or more, you can not drink only 1 cup, because it mean i respect you and you have to answer me. After she tests, if quality of wine 's good, she'll buy all that wine can, not a part.