By moving the cilantro around, you help to rinse away dirt particles underneath and between the leaves[1] X Research source

For instance, pico de gallo is usually made with cilantro leaves. [3] X Expert Source Randall ChambersPersonal Chef Expert Interview. 1 March 2022.

You can place a moist washcloth underneath the cutting board to help provide traction so the cutting board does not slide around when you are chopping the cilantro bundle.