Dab meat dry, wrap tightly in foil and freeze for at least 3 hours. Put the egg yolks, mustard and 1 tablespoon of vinegar in a bowl. Season with salt and pepper. Whisk with the whisk of the hand mixer for approx. 1 minute.
First add the oil drop by drop (approx. 5 tbsp.), then slowly add the oil in a thin stream while stirring continuously. Season mayonnaise with salt, pepper and possibly vinegar and chill.
Wash, clean and sort the rocket, drain well. Chop the parmesan into fine shavings. Pour mayonnaise into a piping bag. Remove meat from the freezer and cut into very thin slices with a sharp electric slicer or a very sharp knife.
Use the rest of the meat for other purposes. Arrange meat on plates. Spray mayonnaise onto them in a grid pattern. Place rocket and parmesan in the middle of the dish. Sprinkle with freshly ground pepper and serve.
Use any remaining mayonnaise for other purposes. Ciabatta bread tastes good with it.