Boil the potatoes for about 20 minutes, then peel them and cut them into slices. Dice the tomato, onion and smoked pork.
Fry the smoked pork in hot oil. Add the onion and fry briefly. Take out both. Deglaze the frying fat with the cream and stock and cook for 10 minutes. Add 100 g of grated cheese to the sauce and let it melt. Season with salt, pepper and nutmeg. Put half of the ingredients in a greased casserole dish and pour half of the sauce over them. Sprinkle with 20 g of cheese. Pour the remaining ingredients, sauce and cheese over it. Bake in a hot oven: (electric stove: 200 ° C / gas level 3) for 20-25 minutes.