One is because of eating habits, and the other is because it has bactericidal effect. Use mustard with sashimi, because the bactericidal ingredients contained in mustard can kill bacteria such as Escherichia coli and Staphylococcus aureus, and inhibit the growth of toxic bacteria such as mold in food. In addition, according to the data of Japan Food Nutrition Research Institute, mustard can also inhibit the activity of carcinogens and acidifying enzymes in the liver.