Wash the potatoes thoroughly, place them in a pot with water, bring to the boil and cook for about 20 minutes. Meanwhile wash the chives, dab dry and cut into fine rolls. Wash basil and thyme, dab dry, pluck leaves from the stalks and chop finely.
Wash parsley, dab dry and also chop finely. Peel and finely chop the onion. Mix quark, oil and mineral water. Put 1 teaspoon of chopped herbs aside for garnishing. Stir the remaining herbs and onion into the quark.
Season with salt and pepper. Pluck the marjoram leaves from the stalks, wash them and carefully dab dry with kitchen paper. Drain the potatoes, rinse with cold water and peel. Wrap bacon and marjoram leaves around the potatoes, place on a grill grid covered with aluminium foil and grill for 8-10 minutes, turning several times.
Serve the potatoes in a bowl garnished with marjoram. Add the herb curd cheese sprinkled with the remaining chopped herbs and pepper in a small bowl.