Salisbury Steak With Mushroom Brown Gravy Recipe

Name: Salisbury Steak With Mushroom Brown Gravy Recipe
Ingredients: 4 ounces crustless white sandwich bread (115g; about 4 slices), diced; 1/3 cup (80ml) milk; 1 teaspoon (about 4g) cornstarch; 1 1/2 cups (355ml) homemade chicken stock or store-bought low-sodium chicken broth (see note); 1 1/2 pounds (680g) ground beef, preferably about 20% fat; 1/2 pound (225g) ground pork; 1 medium yellow onion (10 ounces; 285g), half finely minced and half diced, divided; 2 large egg yolks; 4 teaspoons (18g) Diamond Crystal kosher salt (for table salt, use half as much by volume or use the same weight), plus more as needed; Freshly ground black pepper; 1 teaspoon (about 4g) onion powder; 1 teaspoon (about 4g) garlic powder; 1/4 teaspoon (1ml) good-quality liquid smoke, such as Wright's or Colgin (optional; see note); 2 tablespoons (30ml) vegetable oil or other neutral cooking oil, plus more if needed; 10 ounces (285g) cremini or button mushrooms, stemmed, caps thinly sliced; 2 teaspoons (10ml) ketchup or tomato paste; 2 teaspoons (10ml) Worcestershire sauce; 1 tablespoon (15g) unsalted butter; Apple cider vinegar, to taste