Wash the potatoes and cook covered for about 20 minutes. Quench and peel. Let cool for at least 4 hours, preferably overnight. Grate coarsely.
Heat 2 tablespoon butter in an ovenproof pan (28 cm). Add grated potatoes. Season with salt, pepper and nutmeg. Press everything together into a potato flatbread and fry briefly on the underside. Spread 3-5 tablespoon cream and 1 tablespoon butter in flakes on top. Then bake in the preheated oven (electric stove 225 ° C, fan 200 ° C, gas mark 4) for about 25 minutes.