Caramelized Onion, Mushroom and Bacon Stuffed Burger

There is something about the smell of charcoal on a hot summer day that creates such a perfect day for me. So even though it has been a rather mild winter, I can't wait for the cold weather to go away and for the sun to feel warm on my skin again. At the first hint of good BBQ weather I plan on throwing a party so I can enjoy this delicious burger hot off the grill.  This is an easy way to make in impressive gourmet burger and you really could use any stuffing ingredients that you want. The key is to make sure the pieces are small so it is easy to fold into the patty.