Horseradish Mustard The original since 1922, made with a smooth yellow mustard base and enhanced with the hot flavor of horseradish and a few secret ingredients. The number one selling mustard in the Buffalo, New York region for more than 50-years. Add some to your potato salad or deviled eggs for a new taste sensation. For the health conscious- this is the ultimate fat-free alternative to mayonnaise along with being gluten-free and "0" carb.