Quarter the turnip, peel, wash and cut into cubes. Peel and finely chop the onions. Wash the marjoram and remove the leaves. Peel, wash and chop the potatoes. Cook in salted water for about 20 minutes
Heat 1 teaspoon of oil in a pot. Brown the onions in it. Sauté the turnip briefly. Season with salt and pepper. Add just under 300 ml water, stock and marjoram, except for a little to garnish. Bring to the boil, cover and cook for 15-20 minutes
Dab the fillet dry. In 1 teaspoon hot oil in a coated pan, fry thoroughly all around. Season with salt and pepper. Fry over medium heat for 15-17 minutes
Heat the milk. Drain and coarsely mash the potatoes, stir in the milk. Season with salt and nutmeg
Remove the fillet. If necessary, dissolve the meat with a little water and pour it into the turnip. Season to taste with salt and pepper. Cut the fillet open. Garnish with turnip vegetables, stock and a dash of sour cream. Add the purée.