Mix the yolks of 2 hard-boiled eggs with the sour cream, vinegar, mustard, as well as salt, pepper and a pinch of sugar to make a thick sauce. Then there are the finely chopped herbs. Stir everything well and let it steep for at least 5 minutes.
Variation:
Other fresh herbs can also be used at will. The quantities given are variable. A little easier if half of the sour cream is replaced with a mild yogurt.