Wash and halve the tomatoes. Peel onions and cut into fine strips. Wash chives, shake dry and cut into fine rolls. Season 3 tablespoons of vinegar with salt, pepper and a little sugar. Fold in 3 tbsp. olive oil. Mix the tomatoes, onions, chives and vinaigrette and leave to stand
Peel and wash the potatoes and cook them in boiling salted water for about 20 minutes. Wash the chicken fillets and pat them dry. Heat 1 tablespoon of olive oil in a frying pan. Fry the chicken fillets for 10-12 minutes while turning. Remove from the pan, season with salt and pepper
Wash the herbs, shake dry and, except for something to garnish, pluck leaves from the stems. Chop the herbs to 1/4. Mix sour cream, mayonnaise and milk and chop the chopped herbs finely with a blender. Season to taste with salt, pepper, sugar and 3 tbsp. vinegar
Drain the potatoes. Arrange chicken fillets, potatoes and sauce on plates and garnish with the remaining herbs. Add tomato salad