Wash the cured pork loin and pat dry. Peel, halve and finely chop the onions. Wash, clean and slice the mushrooms. Wash the parsley, pluck the leaves from the stems and chop them, except for a few for garnishing. Put the slices of sliced pork on a fat pan. Spread onions and mushrooms on top. Stir cream and sour cream until smooth, season with pepper, stir in chopped parsley and pour over.
Leave to stand for 4-5 hours. Drain pineapple, grate cheese. Spread the pineapple on the slices of sliced pork and sprinkle the cheese on top. Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for approx. 30 minutes. Clean and wash spring onions and cut into very thin rings. Sprinkle on top before serving. Serve garnished with remaining parsley