Season beef fillet with salt and pepper and rub with 1 tbsp truffle oil.
Sear beef fillet in a hot frying pan for 1 minute a side until browned. Cool and wrap tightly in cling film. Place in the freezer for 1 hour
While beef is in cling film, slice and discard the end piece. Slice thin rounds
and place between two sandwich bags. With a rolling pin, gently flatten meat to 2mm thick.
Arrange carpaccio slices on a plate with rocket leaves and drizzle over lemon juice and truffle oil.