Spicy tradition - who tastes Mostaard Wostyn for the first time, immediately knows this is not just any mustard. It is super finely ground from exquisite dark Brassica Nigra mustard seeds, hence its extraordinary aroma mustard flavor. This mustard is prepared from brown mustard seed, ground between granite stones, which explains its fine structure and color. The mustard seed is first broken, then stirred and ground.