I've finally tweaked until I have a mustardy, tangy, only SLIGHTLY sweet BBQ sauce in the style of North Carolina vinegar sauces. This is great on chicken and pork, and makes for delicious ribs for we-less-than-fond-of-tomato-an-sugar-based-sauces!
Combine all ingredients together in non-reactive saucepan. Bring just to boil over medium heat. Reduce heat and simmer for 25 minutes until slightly reduced and thickened. Cool. Keep coverered in frigerator.