What is Chiffonade?
How to Chiffonade
So Chef asks you to prepare a Chiffonade. Would you know what to do?
Panic or get chopping?
A Chiffonade is French for a "little ribbon".
So you take some herbs or a leafy green veg, roll them tightly and cut them across the roll to produce long narrow strips or ribbons.
You can do a similar thing to crepes to produce strips for serving with accompaniments.