Peel and wash the potatoes and cook them in boiling salted water for about 20 minutes. Wash the meat, dab dry and cut one pocket each into the meat with a sharp knife. Spread cream cheese into the pockets.
Close the opening with a wooden skewer. Season meat with salt. In the meantime heat 1 tablespoon of oil in each of two frying pans. Fry the meat for about 10 minutes while turning. In the meantime melt 1 tablespoon of fat.
Peel and finely dice the onion, add and sauté briefly. Dust with flour. Add 100 ml milk and stock while stirring, bring to the boil and simmer for 2 minutes. Keep sauce warm. Cook the beans in boiling salted water for about 5 minutes.
Drain the beans, add to the sauce and keep warm. Drain the potatoes and let them evaporate briefly. Heat 1/4 litre of milk and 2 tablespoons of fat. Add to the potatoes and mash. Season with salt and nutmeg.
Season meat with pepper. Arrange puree, beans and meat on plates.