Boil the egg for 8 - 10 minutes (recording to egg size) so that they are well done cooked.
Put in a bowl vinegar, salt, fresh or dried herbs, mayonnaise, custard / senf and squir well through so you will have a nice emulgation. Then add the olive oil to it and squir again.
Next slice the cucumber in very thin cubes and put in salad sauce.
Prepare a thin plate. If the eggs are cooked let them cool down under cool water 💧. Then remove softly the egg shell.
Use an egg cutter or slice the eggs in very thin nice slices and lay them in circles on the prepared plate.
In a last step put the salad sauce over the eggs and do a pinch of salt all over and some herbs for decoration.
You can serve a slice of bread to it or another green salad.