Peel the onion and lard with cloves. Peel or clean, wash and finely chop the carrots, celery and leek.
Wash the meat and dab dry. Rub with salt and pepper. Heat oil in a roasting pan. Brown the meat thoroughly all around, take it out. Sauté the vegetables, bay leaf and peppercorns in the frying fat.
Add onion. Place the meat on top of the vegetables.
Melt 60 g butter, stir in sugar, caramelise. Add 50 g flour and sweat it on. 1⁄4 l Pour on water and wine, bring to the boil and stir in stock. Pour everything over the roast. Cover in a preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) and braise for approx. 2 3⁄4 hours.
Wash, boil, quench and peel the potatoes. Press immediately through a potato ricer. Knead with 75 g butter, egg yolk, egg, 150 g flour, breadcrumbs and 1 teaspoon salt (the mixture sticks a bit).
Put it on a piece of foil and form a rectangle (approx. 30 x 35 cm) with floured hands. Roll up the foil from the long side and wrap it tightly in a tea towel (remove the foil).
Tie ends with kitchen yarn.
Heat plenty of salt water in an elongated roaster. Cover the potato roulade in a tea towel and let it simmer for about 45 minutes.
Remove meat from the roaster and keep warm. Sieve the sauce and season to taste. Cut the potato roll into slices. Arrange everything. Garnish with rosemary and parsley. Serve with winter vegetables, e.g.
Carrots, black salsify and fennel.