Nothing goes with an iconic German-style bratwurst like creamy, traditional Koops' Düsseldorf Mustard. Koops’ mustards are made from the finest ingredients. There are no complicated additives listed on the back of our bottles, no hard to pronounce chemicals or scary sounding preservatives. Just quality ingredients like mustard seed, vinegar and water. Our Düsseldorf Mustard comes in a package of four 12 oz. bottles and is Certified OU Kosher and Certified Gluten-Free. Peter Koops started his mustard business over 120 years ago with a hand crank mustard mill and incredible recipes. And while we’ve updated the manufacturing process with the times, we’ve stayed true to the bold flavor and simplicity of his original recipes. Koops’ isn’t your ordinary mustard. It’s extraordinary mustard. With fourteen bold flavors that can satisfy any appetite, it makes good food great and great food amazing. Made in Wisconsin. Enjoyed Everywhere.