For the mayonnaise, mix egg yolk and mustard. Season with salt, pepper and vinegar. Gradually add the oil, stirring constantly, and season to taste again. Peel and finely chop the onion.
Finely chop the cucumber and capers as well. Wash herbs, dab dry and chop. Put some chopped cucumber, capers, onion and herbs aside for sprinkling. Mix the remaining prepared ingredients, mayonnaise and tartar.
Season with salt, pepper, paprika and cognac. Hard boil the egg for about 10 minutes. Then rinse with cold water, peel and slice. Clean, wash and finely dice the bell peppers. Clean, wash and carefully cut the chicory into slices.
Form tartar into cams. Sprinkle chicory with orange juice. Arrange tartar, chicory and egg slices on plates. Sprinkle with remaining chopped cucumber, onion, capers and herbs. Serve garnished with orange slices and parsley.