Northeast sauerkraut is a delicious food in Northeast China, with mustard as the main ingredient, and its taste is sour and refreshing after pickling. The pickling method is simple. Wash mustard, air dry it and put it in a jar. Boil salt water and add ginger slices, then pour it into the jar, seal it and put it in a cool place. Pay attention to keep the temperature and humidity and avoid direct sunlight. Can be taken out and eaten after one month.