Chiffonade, by creating thin ribbons of herbs, increases the surface area exposed to air, allowing volatile bitter compounds to dissipate more quickly, thus reducing bitterness.
Chiffonade is a cutting technique used primarily for leafy herbs and vegetables. It involves rolling the leaves tightly together and then slicing them thinly, creating long, delicate ribbons. The act of cutting and exposing more of the herb's surface area to the air facilitates the release of volatile compounds. Some of these compounds contribute to the bitter taste of certain herbs, such as basil or mint. By increasing the surface area, the chiffonade cut allows these compounds to evaporate or oxidize more rapidly, resulting in a milder, less bitter flavor profile. This is particularly useful when using herbs raw, where their bitterness would be more noticeable. The thin ribbons also integrate more seamlessly into dishes, distributing the flavor evenly.
For herbs that are particularly prone to bruising or browning, such as basil, chiffonade them just before serving to minimize oxidation and maintain their vibrant color and fresh flavor.