A group of fresh leeks with roots
The Ice Water Trick To Get Rid Of All The Grit From Leeks
For most vegetables, a rinse under the tap will wash them thoroughly, but that's not enough for leeks, which have tons of little nooks and crannies where dirt can hide.
If you only rinse your leeks, you'll find soil lodged between the rings of its tightly-packed leaves when you cut into the white stalk. This can be solved with some ice water.
Cut off the bottom of the leek and stand the stalk upright in a container full of ice water. This position will unstick the leaves from each other and keep their shape intact.
Leave the leeks to soak for 15 minutes, and dirt will settle to the bottom of the container as the layers of the veggie loosen up. Then, remove the stalks and prepare as usual.