Spicy german mustard

1. Soak mustard seeds & the powder in the cold water for 3 hours.
2. Combine the remaining ingredients in a glass or porcelain pan & simmer until the mixtue is reduced by half, about 10 minutes.
3. Pour through a strainer onto the mustard mixture.
4. Transfer to a double boiler.
5. Cook & stir until thickened, about 10 minutes.
6. Spoon into a container & cover.
7. Refrigerate for 3 days before using.
8. Makes a good dressing for german potato salads.