MOP Sausage Burgers

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2 tablespoons extra-virgin olive oil

1/2 pound cremini mushrooms, sliced

1 large onion, quartered lengthwise then sliced

2 Cubanelle peppers, seeded and halved lengthwise, then thinly sliced

Salt and freshly ground black pepper

1/2 cup beef stock

1 pound bulk hot Italian sausage

1 pound ground sirloin

1 tablespoon grill seasoning

2 large cloves garlic, grated

A handful flat-leaf parsley, finely chopped

8 deli slices provolone cheese

4 sesame Kaiser rolls, split