Wash the potatoes thoroughly, cut them in half, place them on a baking tray (with the cut edges facing upwards) and brush with oil. Bake the potatoes in a preheated oven (electric cooker: 200 °C/ gas: level 3) for about 25 minutes.
In the meantime clean and wash the spring onions and cut them into fine rings. Clean, wash and quarter the radishes. Clean and wash the carrots, cut them in half lengthwise and cut into thin slices. Mix meat salad and yoghurt.
Season to taste with salt and pepper. Mix in spring onions, carrots and radishes. Wash parsley, dab dry and chop finely. Remove potatoes from the oven, sprinkle with coarse salt and parsley.
Arrange potatoes on lettuce with radishes and parsley on a plate. Serve the salad in a small bowl.