Wash the meat and cut into strips that are not too thin. Wash the carrots and leeks. Cut the carrots into slices and the leek into small pieces.
Heat the oil in a pan, add the meat and season with salt, pepper and paprika powder. Remove the meat when it is well seared. Put the carrots and leeks in the pan, fry them briefly, then deglaze with the stock and cook the vegetables al dente for about 5 - 7 minutes. Add the meat and let it simmer for 1 - 2 minutes, then remove everything from the heat. Stir the crème fraîche into the sauce and season again to taste.
Noodles go very well with this.
Tip: Depending on the season, you can add a little something to the vegetables, for example with kohlrabi or paprika.