In a small bowl, combine mustard seeds, and 1/3 cup boiling water.
In another small bowl, combine powdered mustard with 1/3 cup warm water, set both bowls of mustards aside for 10 minutes for flavors to develop.
In a small saucepan, combine vinegar, brown sugar, flour, salt, onion powder, garlic powder, cinnamon, allspice, cloves and reserved mustards. Bring this to a boil stirring constantly. Cook and stir this for about 2 minutes or until it thickens nicely.
Pour into a small bowl, cover and refrigerate overnight.
Next day use a wire whisk, beat until smooth. Spoon into a container with a tight fitting lid. Refrigerate. Makes aprox. 2 cups.