I like beer mustards. Here you go:
7-Pot Porter Mustard
Makes about 1 to 1-1/2 pints
1 cup porter beer, chilled
1/2 cup yellow mustard seed
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1-1/2 cups white wine vinegar
2 tablespoons sweet onions, chopped
5 cloves garlic, minced
1 tablespoon shallots, chopped
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2 ounces mustard flour
1 tablespoon 7-pot powder
1/8 cup water, chilled
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1-1/2 teaspoons salt
2 teaspoons brown sugar
1/2 teaspoon allspice, ground
Pour the porter over the mustard seeds and let it sit overnight.
Place the vinegar, onion, garlic, and shallots in a saucepan and simmer slowly until the mixture is reduced by 2/3. Strain and chill (discard solids).
Make a paste of the mustard flour, 7-pot powder, and water and let it sit for 20 minutes.
Stir everything together and mix well. In a food processor pulse until the mustard seeds are partially ground and the mixture is well blended.
Transfer it to the saucepan and simmer over low heat until it thickens, 10-15 minutes.
Let it cool and place in a glass jar. Let is age 3 weeks to one month in a cool, dry area.