Skewer, tie in shape, and lard upper side of calfs liver. Place in deep pan, with trimmings from lardoons; surround with one-fourth cup each, carrot, onion, and celery, cut in dice; one-fourth teaspoon peppercorns, two cloves, bit of bay leaf, and two cups Brown Stock or water. Cover closely and bake slowly two hours, uncovering the last twenty minutes. Remove from pan, strain liquor, and use liquor for the making of a brown sauce with one and one-half tablespoons butter and two tablespoons flour. Pour sauce around liver for serving.