Wash the potatoes and cook in boiling water for about 20 minutes. Cook 3 eggs in boiling water for about 10 minutes. Drain the eggs, rinse with cold water and peel them, let them cool down. Drain potatoes, rinse with cold water, peel and let cool off.
In the meantime, soak toast in water. Peel and finely chop the onion. Knead minced meat, onion, 1 egg, dried herbs, tomato paste and well squeezed bread. Season with salt and pepper.
Drain the mozzarella balls. Add 1 mozzarella ball to each portion of the chopped mass and press down well. Form balls. Heat oil in a pan. Fry the balls over a low heat for 8-10 minutes.
Clean, wash and cut the spring onions into rings. Wash, clean and halve the tomatoes. Wash the herbs, dab dry, put something aside for garnishing, cut the rest finely. Mix yoghurt, salad cream, vinegar and herbs.
Season to taste with salt and pepper. Cut the potatoes into slices. Dice eggs. Mix all prepared ingredients. Flavour with salt and pepper. Serve meatballs with salad. Garnish with put aside herbs.