I might start with this and see what happens.
Vinegar Sauce Epicurious | April 2008
by Steven Raichlen
The Barbecue! Bible 10th Anniversary Edition
Yield: Makes about 4 cups
ingredients
* 2 cups cider vinegar
* 1/2 cup plus 2 tablespoons ketchup
* 1/4 cup firmly packed brown sugar, or more to taste
* 5 teaspoons salt, or more to taste
* 4 teaspoons hot red pepper flakes
* 1 teaspoon freshly ground black pepper
* 1 teaspoon freshly ground white pepper
Preparation:
Combine the vinegar, ketchup, brown sugar, salt, red pepper flakes, black pepper, and white pepper with 1 1/3 cups of water in a nonreactive medium-size bowl and whisk until the sugar and salt dissolve.
Taste for seasoning, adding more brown sugar and/or salt as necessary; the sauce should be piquant but not quite sour.
Source Information:
Excerpted from The Barbecue! Bible 10th Anniversary Edition by Steven Raichlen, © 1998. (Workman)
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http://www.epicurious.com/recipes/food/views/Vinegar-Sauce-242391