Mustard/ˈmʌstərd/ Definition 1 of 4Pro Tip 1/2Culinary Use Used primarily to add flavor to food, often in sandwiches or hot dogs. I prefer honey mustard on my hot dog. Pro Tip 2/2Varieties Available in different types like Dijon, yellow, and whole grain reflecting regional tastes. For this dish, Dijon mustard works best.