Knead the ground pork and half of the herbs, then form into small dumplings. Heat the oil and fry the dumplings all around. Fry over a mild heat for about 3 minutes. Then take them out.
Onions peel, in columns cut. Peel, dice and wash the potatoes and dab them dry. Fry both until crispy in frying fat. Season with salt and pepper. Deglaze 1/2 litre water and add vegetables, bring to the boil and cook for 8-10 minutes.
Shortly before serving, add dumplings and sprinkle with the remaining herbs. Refine the crème fraîche with mustard and put it as a blob on the stew.