You may be tempted to substitute another type of fancier mustard for the yellow mustard listed in the ingredients above. I would avoid using anything fancy here like Dijon or whole-grain mustard and stick with the classic American yellow mustard. Folding in a bit of whole-grain mustard after the sauce has cooled might be a nice idea, although you would probably not see this in a more traditional SC-style BBQ sauce.
This sauce will keep great in the fridge for up to a week after you make it.