What is "gulden's"

Gulden's, a brand of American mustard, is the third largest American manufacturer of mustard, after French's and Grey Poupon. The oldest continuously operating mustard brand in the United States, it is now owned by agricultural giant ConAgra Foods.

Gulden's is known for its spicy brown mustard, which includes a blend of mustard seeds and spices. The Gulden's mustard recipe has remained a secret for more than 140 years.