Parboil a sweetbread ten minutes, chop, and rub through sieve; there should be one-half cup. Mix with one-third cup breast meat of a raw chicken, and rub through sieve. Pound in mortar, add gradually white of one egg, and work until smooth, then add three-fourths cup heavy cream. Line buttered timbale moulds with mixture, fill centres, cover with mixture, place in a pan of hot water, cover with buttered paper and bake until firm. Remove to serving dish, and pour around sauce.
Filling. Melt one tablespoon butter, add one tablespoon corn-starch, and pour on gradually one-fourth cup White Stock; then add one-third cup parboiled sweetbread cut in cubes, one tablespoon Sherry wine, and salt and pepper to taste.
Sauce. Melt three tablespoons butter, add three tablespoons flour, and pour on one cup rich chicken stock and one-half cup heavy cream. Season with one tablespoon Sherry wine, one-fourth teaspoon beef extract, and salt and pepper to taste.