Midwest Salisbury Steak

Ingredients

• Patties:
• 1 pound ground sirloin
• 1/2 cup panko bread crumbs
• 1 egg, beaten
• 2 tablespoons milk
• 1/2 (1 ounce) package dry onion soup mix
• 1 teaspoon Worcestershire sauce
• 1/4 teaspoon ground black pepper
• Gravy:
• 3 tablespoons butter
• 2 cups fresh mushrooms, sliced
• 1 sweet onion, sliced
• 3 tablespoons all-purpose flour
• 1/2 (1 ounce) package dry onion soup mix
• 1 1/2 cups beef stock
• 1 cup water
• salt and ground black pepper to taste