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Stop by the Mustard Museum in the Altstadt to taste—and pick up a jar or two—of Germany’s most famous condiment. Here you’ll find a slew of mustard varieties—more than you ever knew existed—from the classics (mild, medium, spicy) to quirkier flavors such as honey and dill, sherry, and coconut curry. Also look for the special Mustard of the Month, and unique flavors during the winter holidays, like mulled wine mustard and Christmas mustard made with clove and cinnamon. While most of the products are from Löwensenf, a well-known Düsseldorf mustard company that was founded in the early 1900s, you can also find smaller, rarer labels including ABB and Radschläger. The “museum” part is toward the back of the shop, and includes historical photos, details of the mustard-making process and best of all, a display of old glass and ceramic mustard jars, including a centuries-old stoneware pot emblazoned with “ABB,” a brand that’s been around since 1726.