My buddy made this sauce up this weekend as a finishing sauce for some ribs we smoked, everyone loved it so he posted the recipe on another forum I'm on and I thought I'd share it here.
1 cup yellow mustard
1 cup apple cider vinegar
1 tbsp coarse ground black pepper
1 tbsp hot sauce (red hot, Louisiana)
1 tsp garlic powder
1 tsp onion powder
1/2 tsp paprika
1 tbsp white sugar
1/2 tsp white pepper
Mix it together and add hot sauce to your liking!
Better if left in the fridge overnight.