Boil eggs hard in about 10 minutes, rinse with cold water and peel. Wash tomatoes and cucumber. Halve cherry tomatoes, cut remaining tomatoes and cucumber into slices. Peel onion and cut into rings.
Wash the basil, pluck the leaves from the stems. Arrange prepared salad ingredients and olives on a plate and garnish with some basil leaves. Sprinkle with pepper. Coarsely chop the remaining basil.
Remove the egg yolk. Mix the egg yolks, mustard, salt and pepper with the whisks of the hand mixer in a high mixing bowl. Gradually beat the oil into the mixture. Finally add basil and season to taste again.
Pass the sauce to the salad. Grissini sticks taste good with it.