Eastern North Carolina Barbeque Sauce With Butter - #1

Sauces

8 tablespoons mustard
1 teaspoon pepper
6 tablespoons sugar
1 teaspoon white pepper
1 cup cider vinegar
1/2 teaspoon soy sauce
2 teaspoons chili powder
2 tablespoons butter

Combine all but soy and butter, heat 10 min. Add Soy and butter at end.