From time immemorial, soups and broths have been the worldwide medium for utilizing what we call the kitchen byproducts or as the French call them, the 'dessertes de la table' (leftovers), or 'les parties interieures de la bete', such as head, tail, lights, liver, knuckles and feet.
The Soup Book: Over 800 Recipes (ed. Courier Corporation, 2012) - ISBN: 9780486144498