The number one selling horseradish mustard started at the Broadway Market in 1922 and going strong ever since Weber's Mustard has been a staple of WNY culture for over 80 years. There isn't a home fridge in the area that doesn't have at least one variety. Ingredients: mustard seed, vinegar, water, horseradish, tumeric, red pepper, salt, natural flavorings, guar gum, xanthan gum, ascorbic acid, soybean oil, sodium benzoate (a preservative), red 40