Prepare the beef: Place the eye fillet in the freezer for about 15–20 minutes — this will firm it up and make it easier to dice finely.
Using a sharp knife, finely dice the beef. Season lightly with salt and pepper.
Shape the tartare: Mound the diced beef in the centre of a serving plate. Use a circle cutter if you have one to keep it neat.
Use the back of a spoon to create a small dent in the top of the tartare.
Carefully place the egg yolk in the dent so it stays in place.
Arrange the accompaniments: Neatly place the shallots, capers, cornichons, Dijon mustard, and chives around the beef.
If using, lightly grate some parmesan over the top of the tartare.
Serve: Offer Tabasco and Worcestershire sauce on the side so guests can adjust to taste.
Serve with toasted baguette slices or potato chips for added crunch.