Homemade Horseradish Mustard - cooking recipe

Ingredients

1/2 cup Coleman's dry mustard
1/2 cup hot tap water
1/2 cup white wine vinegar or 1/2 cup rice vinegar
2 teaspoons kosher salt
1 tablespoon bottled horseradish
1 clove garlic, peeled and sliced
1 teaspoon sugar
6 whole black peppercorns, crushed in a mortar,or pinch of ground black pepper
2 whole allspice berries, crushed in a mortar,or small pinch ground allspice
dry white wine, optional

Preparation

Stir together the dry mustard and water and let stand, uncovered, for 20 minutes, stirring once or twice.
In the container of a blender or a food processor, combine the vinegar, salt, horseradish, garlic, sugar, peppercorns, and allspice.
Process until the garlic and horseradish have been pureed in the liquid, then strain through a fine-meshed strainer, pressing all juice from any pulp in the strainer.
Combine the strained liquid with the mustard-water mixture in the top of a double boiler set over simmering water.
Cook, stirring constantly, for about 5 minutes, or until the mustard has thickened (it will thicken more while cooling).
Cool and taste.
Add more prepared horseradish, if desired, and if the mustard seems too thick, thin it with a few drops of white wine or additional vinegar.