Turn on the oven (electric cooker: 220 °C/circulating air: 200 °C/gas: see manufacturer). Put the potatoes in the oven immediately and bake for approx. 25 minutes. Dice the smoked pork. Clean and wash spring onions and cut into rings.
Heat the oil in a pan. Fry the cured pork in it for about 5 minutes. Steam spring onions briefly, except for a little green for sprinkling. Stir in mustard, cream cheese, 200 ml water and stock.
Bring to the boil and simmer for about 5 minutes. Season to taste with salt and pepper. Cut potatoes lengthwise and fill. Sprinkle with remaining spring onion.