The history of these Mustard Mills go back to the 18th century. They seem to be the oldest Mustard Mills in Europe. The location of the Mustard Mill in origin is not known. In 1931 the mills were, for the first time, restored in Belgium and they became operative. Afterwards they were sold to Holland, where their operations stopped in 1993. As by chance Mustard Miller Wolfgang Steffens got in possession of these technical Monuments. They were in very poor conditions and with lots of work and effort, the mills were finally successfully restored. Nowadays both mills produce fine grinded Mustard, going out from the original secret recipes. Now, a museum is dedicated to this Cologne specialty!