Boil eggs hard in about 10 minutes. Quench and peel. Wash basil and, except for 3 stems, pluck leaves from the stems. Chop the basil coarsely and put it into a high mixing bowl. Add vinegar and sour cream. Puree everything with the cutting stick of the hand mixer.
Stir in sour cream and parmesan. Season with salt and pepper. Halve 5 eggs. Arrange them with the whole eggs on a plate and pour some basil foam over them. Garnish with the rest of the basil. Add the rest of the basil foam