Cook the lentils in the broth for about 30 minutes. In the meantime, wash the potatoes and cook them in boiling water for about 20 minutes, drain, rinse with cold water and peel. Cut potatoes into slices and season with salt and pepper. Season lentils with salt, pepper and vinegar. Peel and finely chop the onion.
Crumble the feta cheese and add it with the onion to the lentils. Stir in oil. Pour the hot lentil and sheep's cheese marinade over the potatoes and leave to stand for about 10 minutes. Arrange salad with lettuce leaves on a plate and garnish with marjoram as desired
Waiting time approx. 45 minutes