Brush the potatoes vigorously under running water. Cook in boiling salted water for about 20 minutes, drain. Finely dice onion. Knead minced meat, onion and curd. Cut chives into small rolls.
Season mince with salt, pepper and paprika. Knead in half of the chives. Form 2 flat meatballs and fry in 1 tablespoon of oil in a coated pan. Fry over a low heat for about 15 minutes, turning over. Cut the zucchini into thin slices and the tomatoes into small slices. Peel potatoes if necessary, cut in half lengthwise. Heat the rest of the oil in a pan. Fry potatoes, zucchini and tomatoes briefly. Stir in tomato paste, deglaze with vegetable stock. Season with salt and pepper.
Heat the rest of the oil in a pan. Fry potatoes, zucchini and tomatoes briefly. Stir in tomato paste, deglaze with vegetable stock. Season with salt and pepper. Cover and stew for about 5 minutes. Season again and arrange in portions with the meatballs. Serve garnished with the rest of the chives and possibly some parsley