Wash the potatoes well and cook in boiling water for about 20 minutes. In the meantime, wash the chives and chervil, dab dry. Cut chives into small rolls, put some chives and chervil aside for garnishing.
Finely chop the rest of the chervil. Cut the cress from the bed, put some aside for garnishing, chop the rest finely. Clean and wash spring onions and cut into fine rings. Put something aside for garnishing.
Mix quark, crème fraîche, herbs and spring onions, season with salt and pepper. Drain potatoes, rinse and peel. Serve potatoes with herb curd cheese and ham. Sprinkle with remaining herbs and spring onions.