Add vinegar and all other ingredients except mustard to a sauce pan and slowly heat. Put mustard in a cup and slowly stir in a couple tablespoons of sauce until well blended. Then add mustard mixture back to sauce in pan.
Bring to a boil, and lower heat. Let simmer for a few minutes. Let cool, then refrigerate.
Note: this sauce will taste a bit peculiar if you taste it when it is still hot. Don't worry! Something magical happens when it sits in the fridge.
Carbohydrates per Serving (1 tablespoon): Less than 1 gram. Half an ounce is 1 gm carbs, 6 calories.