Glutton Burgers

Ингредиенты

• 1 onion, thinly sliced
• 8 oz (225 g) white mushrooms, sliced
• 2 tbsp (28 g) butter
• 2 tbsp (30 ml) Worcestershire sauce
• 2 tbsp (30 ml) soy sauce
• Salt and pepper
• 1 tsp cornstarch
• 1 cup (250 ml) milk
• 2 tbsp (28 g) butter
• 2 tbsp flour
• 1 cup (250 g) grated sharp yellow cheddar cheese
• 1/2 cup (35 g) finely grated Parmigiano-Reggiano cheese
• 3/4 lb (340 g) ground pork
• 3/4 lb (340 g) ground beef
• 4 hamburger buns
• 4 slices bacon, cooked
• 4 small leaves Boston lettuce
• 8 slices pickle