Coda alla vaccinara

Coda alla vaccinara is an oxtail stew in modern Roman cuisine including various vegetables, notably celery. The tail is considered offal, nicknamed in Rome the "quinto quarto" 'the fifth fourth'.
Preparation.
The oxtail is parboiled and then simmered with large amounts of celery (typically 1.5 kilo of celery for every kilo of tail), carrots, and aromatic herbs. Tomatoes and red wine are added, and then the mixture is cooked further with a soffritto of onions, garlic, prosciutto, pancetta and some other ingredients. During the final phase of cooking, a bouquet garni of bay leaves, celery stalks, and cloves is put in the pot for flavouring. It is cooked until the meat easily separates from the bones. It is seasoned with cinnamon, nutmeg, and black pepper and garnished with pine nuts.
"Coda" is usually prepared to taste sweet-and-sour, usually using raisins, or sometimes candied fruit or a small amount of grated bittersweet chocolate. Coda is generally prepared in advance and reheated. Leftovers can be used as a sauce for rigatoni, which is then named "rigatoni al sugo di coda".
History.
"Coda alla vaccinara" was originally the specialty of the "vaccinari" 'butchers' of the Rione Regola in Rome, to the point that the inhabitants of that rione were nicknamed "mangiacode", 'tail-eaters'. It is often found in the "trattorie" of Testaccio and Trastevere.
Popular culture.
"Coda" is the favourite dish of the protagonist Giacinto Mazzatella (Nino Manfredi) in "Down and Dirty". He expresses his appreciation of the dish with the words "Oxtail and celery are like man and woman. It's all well when one sticks to the other."