The only thing I know for sure about Carolina-style barbecue sauce is that there isn't one. The base is usually always vinegar and pepper, but then depending on which part of the state(s) you're dealing with, there are countless additions and variations.
This one features fresh apple to add a little extra something, but otherwise it's a fairly straightforward, totally in-your-face with tang and heat barbecue sauce recipe. It was fantastic on a molasses-brined pork chop that you'll see in an upcoming video.
One note for those of you that pay particularly close attention to these videos; you may wonder why I mash the cooked apples in the saucepan, when I'm going to put the sauce in the blender anyway. Extreme sauce ugliness, that's why.
I was originally going to leave the sauce unblended, with the hopes the apple would basically disintegrate into the sauce, but when I stirred in the mustard the sauce suddenly looked like the opposite of something you'd want to eat.