Heat a large frying pan with a little oil and evenly sear the meat for 10 - 15 minutes or until dark brown.  Rotate the meat slowly to ensure that the whole surface gets browned.  At this point you're not trying to cook the meat, you are only searing the outside as I feel it makes it a little more appetising; some people don't even sear it - they leave it raw.  Allow to cool.

Drizzle a little oil on a large piece of foil and spread the cracked peppercorns and ciltantro or basil in the centre.

Roll the fillet in the mixture so that it is completely covered with pepper and herbs.  Wrap it in the foil and and tightly secure the ends.  Refrigerate for 30 minutes before transferring to the freezer.  Freeze for 4 -5 hours.

Make the tomato vinaigrette by combining all the ingredients below in a bowl and store in the fridge until needed.

Remove the meat from the freezer and allow to stand at room temperature for about 45 minutes, depending on the temperature outside.

If you have a cold-meat slicer or an electric bread slicer, slice the fillet paper-thin.  Otherwise, using a very sharp carving knife, slice the fillet as thinly as possible.  Lay the slices on a platter, cover and refrigerate.

Just before serving, drizzle the tomato vinaigrette around the edges of the platter.  Do not put it directly on the meat, as the vinegar will 'cook' it.