Boil the chicken giblets with the water, remove the foam. Cook open at reduced heat, skimming occasionally. Meanwhile, clean and coarsely chop the greens. Pluck parsley leaves from stems and set aside. Add greens and parsley stems to the clear soup. Season with a little salt. After thirty minutes, pour the clear soup through a very fine sieve, let it stand for ten minutes, degrease it and, if necessary, boil it down to 400 ml (using one liter of water as a starting quantity).
Peel the potatoes and put them in cold water.
Fry the bacon slices in the oil at low temperature until crispy, remove with a skimmer and drain on kitchen roll.
Dry the potatoes and fry them in the bacon fat, season with freshly grated nutmeg. Add the chicken soup and cook the potatoes for twenty minutes at low temperature with the lid closed. Later boil the liquid at high temperature to 125ml, stir in the sour cream or crème fraiche, season with salt.
Coarsely chop the parsley leaves and stir in. Serve the potatoes with the bacon.