Peel, halve and wash the potatoes. Peel, wash and cut carrots into thick slices. Heat the fat in a pot. Brown the potatoes and carrots in it. Add stock, bring to the boil and cook for 10 minutes.
Clean and wash the leek, cut into rings and add to the potatoes about 5 minutes before the end of the cooking time. Remove the vegetables with a skimmer and put them into a large casserole dish. Mix the flour with some cold water and thicken the vegetable water with it. Season to taste with salt and pepper. Heat the oil in a pan. Fry the smoked pork on each side for 1-2 minutes. Arrange the slices of pork on the vegetables. Pour sauce over them and sprinkle with cheese. Sprinkle with paprika.
Fry the smoked pork on each side for 1-2 minutes. Arrange the slices of pork on the vegetables. Pour sauce over them and sprinkle with cheese. Sprinkle with paprika. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas mark 3) for 20-25 minutes until golden brown. Sprinkle with parsley and serve