Soak the heart in cold water about 1 hour. Wash thoroughly and remove the muscles and arteries. Make a filling of the above ingredients and fill the heart. Fasten securely. Cover with boiling water and boil for 10 minutes. Reduce heat and simmer until tender. Remove heart from
water a half hour before serving and sprinkle with cracker crumbs, salt and pepper. Bake at 350-F until brown. Source: Pennsylvania Dutch Cook Book - Fine Old Recipes, Culinary Arts Press, 1936.