Carefully tap the roulades between 2 layers of foil to make them slightly flatter. Knead veal sausage with mustard and cream and season with 1 pinch of chilli powder. Spread the sausage meat on the roulades. Peel and wash the carrots and celery. Cut a carrot and 50 g celery, cucumber and ham into sticks and spread crosswise on the meat slices. Whip the roulades from the long sides and roll them up from a narrow side. Tighten with roulade needles
Heat the oil in a frying pan and fry the roulades all around. Meanwhile peel and dice the onion and cut the rest of the carrot and celery into small cubes. Put icing sugar in a pot and caramelise in it. Add the vegetables and caramelise, stir in the tomato paste and fry briefly. Deglaze with wine and simmer for 4-5 minutes. Deglaze the roulades with stock and pour into the vegetables. Add the roulades to the vegetables, cover and stew for about 2 1/2 hours
Meanwhile, cook the mustard seeds in salted water for about 20 minutes until soft, pour into a sieve and rinse under cold water. Peel and wash the potatoes. Cook in boiling salted water with caraway seeds for about 20 minutes. Drain the potatoes and press them through a potato ricer. Heat milk. Stir milk, butter and mustard seeds into the potatoes, season with salt and nutmeg
Peel garlic and ginger. After about 45 minutes of cooking time, add juniper berries, allspice seeds, bay leaves, chilli pepper, garlic and ginger to the roulades in the roaster. Remove the roulades. Pass the sauce through a sieve, squeeze the vegetables a little. Stir starch with 2 tablespoons of water until smooth. Stir into the sauce, bring to the boil, season with salt and pepper. Arrange roulades and puree with some sauce on plates