Cut steak into 6 or 8 pieces. Sprinkle with salt and pepper. Beat egg with 2 tablespoons water. Combine parmesan cheese with breadcrumbs, mixing well. Dip meat in egg, then roll in bread crumb mixture. Heat oil in large skillet and fry 3 pieces at a time until brown. Lay in 13x9 inch baking pan. Saute onion in butter and reserved drippings until soft. Add tomato paste, hot water, salt and marjoram. Boilk a few minutes, stirring well. Pour 0.75 cup sauce over steaks. Top with thin slices of mozzarella cheese, then pour remaining sauce over cheese. Bake at 180ºC or about 30 minutes.