1 pound of ground chuck...sirloin...whatever you use. I use chuck
3 tablespoons of pesto
2 liberal pinches of salt
about a 1 teaspoon of pepper
1 clove of garlic grated
mix ( don't over mix) form into four patties
For the toppings.
Make a balsamic syrup
1 cup of balsamic vinegar
1 tablespoon of sugar.... low boil until reduced to a syrup ( you can make enough to use another time) 12-15 minutes
Caramalize onions and mushrooms on low heat until golden using 1 pat of butter and 1 tablespoon of olive oil - mushrooms and onions let out a lot of water.
Grill burgers( I can't stress enough that you really shouldn't over cook these burgers 5-6 minutes per side on a hot grill is perfect)- top with mushroom and onion mixture, provolone cheese and balsamic syrup ( about a tablespoon).