I had some mushrooms that were just beginning to age and this was an excellent way to use them. The sauce is flavorful and the burgers very moist and yummy. I chopped the mushrooms going into the burger rather small so that they would be easier to mix into the meat and that worked well for me. They were a tad messy with dripping sauce but that part of the fun? :D
This is very good and my family enjoyed it. Love the addition of mushrooms!