Koops'™ Mustard Organic Yellow. Smooth & mellow - a true American masterpiece. Gluten free. USDA Organic. Naturally. That's how our family has always made great-tasting mustard since 1897. This USDA Certified Organic mustard contains the highest quality seed. Ingredients come from certified organic farms that are pesticide, herbicide and chemical-free. Our founder, Peter Koops, would be proud! Certified GF, gluten-free. Certified Organic by Quality Assurance International. www.koopsmustard.com.