Wash the potatoes. Cook for about 20 minutes. Quench and peel. Let cool off
Peel and chop the onions. Fry the ground pork in a pan without fat until crumbly. Fry half the onions briefly. Season with marjoram, pepper and possibly salt
Fry the rest of the onions in 1 tablespoon of hot fat. Sprinkle with flour and sauté briefly. Stir in milk, bring to the boil and simmer for about 5 minutes. Grate cheese, stir in. Take the pot off the stove. Whisk eggs and cream, stir in. Season to taste with salt, pepper and nutmeg
Cut the potatoes into slices. Put 3/4 of them into a greased high casserole dish or roasting pan. Spread the ground pork fat on top. Cover with remaining potatoes and sauce. Bake in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 30 minutes