Do not cut the rolls into cubes. Whisk a good 1/4 litre of milk, eggs, some salt, pepper and nutmeg. Pour over the bread cubes and let it rest for about 30 minutes. Meanwhile peel and chop 1 onion.
Finely dice the bacon. Wash parsley, dab dry and chop finely, except for a little to garnish. Melt 15 g fat and fry the bacon briefly in it. Add onion, brown lightly and stir in half of the parsley.
Mix into the bread. Add 30 g flour and knead well. Cover and leave to stand for at least 3 hours. For the ragout, lard 1 onion with bay leaf and cloves. Wash, peel and roughly dice the carrots.
Put onion, carrots and peppercorns in a pot with 1 1/2 -2 litres of water and bring to the boil. Put the knuckle of pork in and simmer for about 3 hours. Lift the finished knuckle of pork out of the stock. Pour stock through a sieve into a pot.
Clean, wash and slice the leek diagonally. Bring the stock to the boil and cook the leek for 5-10 minutes. Remove with a skimmer and measure 1/4 litre of stock. Heat 30 g fat and sweat the remaining flour in it.
Deglaze with stock and remaining milk while stirring, bring to the boil and simmer for a few minutes. Stir in mustard and season to taste with salt. Remove meat from bones and fat, cut into bite-sized pieces and add to the hot sauce with the leek.
Form 5-6 dumplings from the bread mass and let them simmer in plenty of boiling salted water at low heat for about 10 minutes. Then let it simmer without heat for another 5-10 minutes. Drain the dumplings and let them cool down.
In the meantime cut the remaining onion into rings and fry the remaining fat. Remove, cut dumplings into thick slices and fry in hot fat until golden brown. Arrange on a plate and sprinkle with onion rings and remaining parsley and garnish.
Serve with knuckle of pork ragout.