Sweet Mustard Barbecue Sauce

THIS IS SUCH A KEEPER,,yummo

Sweet Mustard Barbecue Sauce
1 cup cider vinegar
2/3 cup prepared mustard
1/2 cup sugar
2 tablespoons chili powder
1 teaspoon white pepper
1 teaspoon black pepper
1/4 teaspoon ground red pepper
1/2 teaspoon hot sauce
2 tablespoons butter or margarine
1/2 teaspoon soy sauce
Stir together first 8 ingredients in a saucepan over medium heat; bring
to a boil, reduce heat, and simmer 10 minutes.
Remove from heat, and stir in butter and soy sauce. Makes about 2 cups.