Chiffonade (French pronunciation: [ʃi.fɔ.nad]) is a chopping technique in which herbs or leafy green vegetables (such as spinach and basil) are cut into long, thin strips. This is accomplished by stacking leaves, rolling them tightly, then slicing the leaves perpendicular to the roll. The technique can also be applied to crepes or thin omelets to produce strips.

“Chiffonade” means little ribbons in French, referring to the little ribbons you create while cutting.

(Source: Wikipedia)