Wipe six French Chops, cut one and one-half inches thick. Split meat in halves, cutting to bone. Cook two and one-half tablespoons butter and one tablespoon onion five minutes; remove onion, add one-half cup chopped mushrooms, and cook five minutes; then add two tablespoons flour, three tablespoons stock, one teaspoon finely chopped parsley, one-fourth teaspoon salt, and a few grains cayenne. Spread mixture between layers of chops, press together lightly, wrap in buttered paper cases, and broil ten minutes. Serve with Spanish Sauce.