Wash the potatoes and cook for about 20 minutes. Quench, peel and let cool off
Clean and wash the leek and cut into fine rings. Fry the ham in a coated pan without fat. Sauté the leek briefly. Add 1/8 l water and vinegar, bring to the boil. Stir in broth and mustard and pour into a large bowl. Cut potatoes directly into slices in the marinade. Season with salt and pepper. Leave to stand for approx. 30 minutes
Peel and finely chop the onion. Knead with tartar, quark, salt, pepper, paprika and thyme. Form 8 small meatballs from it. Fry in hot oil in a coated pan for 5-6 minutes on each side. Season the potato salad again and arrange everything