Though the first time I made this sauce, I was hesitant -- I mean, just LOOK at how much VINEGAR is in it! After "The Hasenpfeffer Incident" about 15 years ago, I've been extremely cautious of recipes that call for more than a few tablespoonsful of the stuff. But the lack of tomato sauce and the large amount of mustard intrigued me. After a while, that is...I had this gem sitting in my database for at least a year before I mustered (HA!) up the courage to serve it to my unsuspecting family. As it turned out, I had no reason for concern. I used it to baste chicken as I cooked it. They asked for seconds immediately, and for thirds, but alas, there were none. I was ordered to make chicken with this sauce again. And again. Since I do not currently have a grill, I used my grill pan, and cooked it over medium heat, covered with whatever lid I could find lying around that would sort of cover it, mostly. An added bonus of the grill pan is the sauce which collects in the bottom and caramelizes. They fight over who gets the pan scrapings! Plus, I had to explain what "caramelization" means, so the kids got a cooking lesson as well!