Clean and scale herrings, remove fins, wash in cold water. Dry well. Season with salt and pepper. Dip herrings in beaten egg, and coat with oatmeal. Fry in hot fat for 4-5 minutes on each side. Drain well on paper towels and keep hot. Wash apples, core, cut in slices and fry in hot fat for a few seconds, turning once. Serve herrings with apple rings on a hot dish. Garnish with parsley sprigs. Serve with a cider sauce.