Wrap the fillet of beef tightly in cling film and freeze for about 3 hours so that it is frozen. Then cut into wafer-thin slices with a sharp electric knife or on a bread machine with a suitable knife insert. If some slices are too thick, simply place them between cling film and carefully roll out with a rolling pin.
Arrange the meat slices as fans on a plate and freshly grind the pepper over them.
Now mix lemon juice with mustard and then stir in the olive oil drop by drop. A foamy marinade should have arisen. Season to taste with salt, pepper, balsamic vinegar, honey and parsley and sprinkle the meat with it.