Marsala Burgers

INGREDIENTS

For the burgers:

1 lb

ground sirloin

2 tbsp

finely chopped yellow onion

1 clove

garlic, minced

1 tsp

salt

1/2 tsp

pepper

1 dash

Worcestershire sauce

For the topping:

slices of bacon or pancetta, chopped

2 cups

white or cremini mushrooms

large garlic cloves, minced

1 tbsp

minced shallot

1 tbsp

tomato paste

1 1/2 cups

Marsala wine (sweet)

1 1/2 tbsp

fresh lemon juice (1 small lemon)

3 tbsp

unsalted butter, cut into pieces, at room temperature

Sliced provolone cheese, for serving

Hamburger buns, for serving