Make the crêpe batter. Mix the eggs with the flour and salt. Add the milk and then the water, mix well. Finally add the melted butter. Cook 8 small crêpes and let them rest.
Place a few sprigs of rocket at the centre of the crêpe, 2 to 3 slices of tomato (de-seeded), 2 slices of Reblochon and 2 slices of cured ham.
Roll the crêpe into a cone shape and fold the bottom underneath the crêpe.
Serve immediately with a few mixed lettuce leaves.