| whole, uncut oxtailskin intact and kept in one piece | 1 tail, 3 to 3½ lb (1.35 to 1.6 kg) |
| very lean beeftrimmed, diced, and very cold | 6 oz (170 g) |
| fatty unsmoked slab baconrind removed, diced, and very cold | 4 oz (113 g) |
| fresh white breadcrumbs | About 1 packed cup (2 oz / 57 g) |
| whole milkfor soaking the breadcrumbs | 1 cup (240 ml / 245 g) |
| large egg | 1 |
| black truffle peelingsfresh or preserved, drained and finely chopped | About ⅓ cup (1½ oz / 42 g) |
| fine sea salt for the forcemeat | 1¼ teaspoons (¼ oz / 7 g) |
| freshly ground black pepper | ¼ teaspoon (0.6 g) |
| ground quatre-épices | Scant 1/16 teaspoon (0.1 g) |
| unsalted light beef stock | 8 cups (1.9 L / about 1.9 kg) |
| water | 4 cups (960 ml / 960 g), plus more if needed |
| yellow onion for poachinghalved | 1 large, about 9 oz (255 g) |
| carrots for poachingcut into large pieces | 2 medium, about 8 oz (225 g) |
| leeks for poachingcleaned and cut into large pieces | 2 medium, about 9 oz (255 g) |
| celery for poachingcut into large pieces | 2 large stalks, about 4 oz (115 g) |
| turnipquartered | 1 small, about 5 oz (140 g) |
| whole cloves | 2 |
| bouquet garni4 parsley stems, 2 thyme sprigs, and 1 bay leaf | 1 |
| fine sea salt for the poaching liquorreserve a little for final adjustment | ¾ teaspoon (4 g) |
| yellow onion for the braising bedthinly sliced | 1 medium, about 7 oz (200 g) |
| carrot for the braising bedthinly sliced | 1 medium, about 4 oz (115 g) |
| celery for the braising bedthinly sliced | 1 stalk, about 2 oz (55 g) |
| arrowroot | 1 tablespoon (0.3 oz / 8 g) |
| cold water for the arrowroot slurry | 2 tablespoons (30 ml / 30 g) |