i have made this one before for pulled pork and like it a lot:
Cider-Vinegar Barbecue Sauce:
3/4 cups cider vinegar
1 cup yellow or brown mustard
1/2 cup ketchup
1/3 cup packed brown sugar
2 garlic cloves, smashed
1 teaspoon kosher salt
1 teaspoon cayenne
1/2 teaspoon freshly ground black pepper
Pan drippings from the pork
credit to tyler florence on this recipe, in which i cut the vinegar in half. you can always add more but the first time i made it as written it was waaay too vinegary.
but if you can find/create someting that closely resembles the sauce at luling city market i would pay just about any amount of money for that recipe.
This might qualify as a mustard-based sauce. Three tablespoons of dry mustard imparts quite a bit of whang to it. For over 20 years, we have made no other sauce for BBQ.
3/4 cup cider vinegar
3/4 hot water
1-1/2 tsp salt
1 tsp coarse ground pepper
1 tsp paprika
2 TB brown sugar
1 TB molasses
3 TB dry mustard
1/2 cup catsup
1/4 cup chile sauce
3 TB Worcestershire sauce
1 clove garlic, pressed
3 TB minced onion
1/2 cup butter
Combine and stir together vinegar, water, salt, pepper, paprika, brown sugar, molasses, and dry mustard in a bowl or big measuring cup. Set this aside.
Saute onion and garlic until onion is translucent, then add catsup, Worcestershire sauce, and chile sauce. Get this up to a boil and add the vinegar mixture.
Move it outside and simmer it for an hour where it can absorb a lot of smoke. This recipe makes enough sauce for about 6 pounds of meat. The first time I made it, it took me back twenty years to catered BBQ events in Texas.