Where does the mustard come from? From Doesburg of course! Mustard has been produced and traded in Doesburg since as far back as 1457. In the Doesburg Mustard Factory you can see how mustard was made in the olden days and how it is done today. The museum attracts tens of thousands of visitors each year. Doesburg mustard soup is a genuine culinary delight! Many restaurants and cafés in the town serve this local speciality on a regular basis. Of course, they all have their own variations, ranging from the traditional recipe with bacon to the more contemporary version with smoked salmon.