For the patties
01 -
1 lb (450 g) ground chuck
02 -
1 large egg, lightly beaten
03 -
2 tablespoons grated Parmigiano Reggiano
04 -
2 tablespoons plain breadcrumbs
05 -
1 teaspoon garlic, crushed to a paste or finely grated
06 -
1 teaspoon kosher salt, plus more for seasoning
07 -
1/2 teaspoon freshly ground black pepper, plus more for seasoning
08 -
2 tablespoons canola oil
For the mushroom gravy
09 -
12 cremini mushrooms, stemmed and quartered
10 -
1/2 white onion, thinly sliced
11 -
1 tablespoon tomato paste
12 -
1 teaspoon Worcestershire sauce
13 -
1 cup (240 ml) beef broth
14 -
2 tablespoons half-and-half
15 -
2 tablespoons chopped fresh flat-leaf parsley