Philly Steak Grilled Cheese - Adams Fairacre Farms

Ingredients

• 1 lb Flank steak, partially frozen
• 1 tbsp Worcestershire sauce
• 1 tbsp Oil
• 1 tsp Coarse ground black pepper
• ½ tsp Kosher salt
• ½ cup Onion, very thinly sliced
• ½ cup Bell peppers, very thinly sliced
• ½ cup Button mushrooms, sliced
• ½ tbsp Cabot Unsalted Butter
• ½ cup Cold milk
• ½ tbsp Cornstarch
• 4 oz Cabot Cheese of your choice, try Horseradish Cheddar, Sharp Cheddar, White American or Yellow American
• Cabot Unsalted Butter
• 8 slices Sourdough bread