I picked up ribs for 108 souls today from Big Jim the pit meister. (You can find him at LazyQ.com if you want.)
Jim had his assistant smearing a concoction on the finished rib slabs, just before he cut them into singles for my order.
I said "What's that mop you're putting on there?"
He said, "It ain't no mop. It's paint!"
It was a solution of brown sugar, vinegar, and yellow mustard. The assistant slathered it on with a big paint brush, and Jim went to whacking the ribs. Quick time.
First I ever heard that term. Maybe the first I ever heard that saucing technique.
Not a conventional BBQ sauce? Or am I missing something?
Whatever the case, it's a simple and very good little trick.