The best burger I ever had, bar none, was when a friend of mine wanted a beef tenderloin, said he would buy it if I grilled it. OK, fine. He went to a butcher shop and ordered a tenderloin and the butcher asked him what he wanted to do with the tailings. My friend had no clue, so the butcher ground it.
We had the filet mignons and they were as usual. The next night I figured I'd have the ground tailings and the same guy came over, and it was better than the filet mignon.