Wrap the sirloin in cling film and freeze it the day before.
Remove the film (if you have difficulties removing it you can place the meat rapidly under cold water) and cut it with a meat-slicer in 1 mm width.
Put the slices on a dish and season them.
Put the rocket salad and the parmesan flakes on the top.
Add the olive oil, cut the lemon in quarters and put one a piece on each plate’s rim.