1: Wash and drain 1 lettuce. Separate leaves that you will prepare as "chiffonnade", and remove the central stalk. You should only keep the tender part of the leaves.
2: Pile up leaves...
3: ...and roll up to make a kind of cylinder.
4: Cut the roll into thin slices, at the beginning it's a bit rough...
5: ...then you'll get tidy slices, which give nice ribbons, and a pretty chiffonnade.
6: Your chiffonnade is ready.
Remarks
You'll get better results with large-leaved lettuces.