Heat the oil in a saucepan and fry the meat in portions. Add the mushrooms and fry them. Then take out the meat and mushrooms.
Sauté the onion cubes in the frying fat, dust with flour and sweat. Add the vegetable stock and white wine while stirring. Boil. Add the carrots, kohlrabi and potatoes and cook covered for about 15 minutes. Add the snow peas five minutes before the end of the cooking time. Add the meat, mushrooms and the crème fraiche or sour cream to the ragout. Finally season with salt and pepper and serve hot.