This is a sauce I got from Steve Petrone on a wsm site. I normally cut the vinegar in half. But I have found this to be a good base that can easily be modified for your taste buds. He likes to add peppers or other preserves to it to change the flavors. I have read many versions that guys have spun off the original so have fun with it!
No. 5 Sauce
1 cup ketchup
1/2 cup cider vinegar
1/3 cup brown sugar
1 tablespoon worchestershire sauce
1 tablespoon rub
Opional but v. good: 1/4 cup meat drippings
(whats left in the foil after the rest)
Simmer to marry the flavors and thicken as desired.