Leeks need to be washed carefully, to remove any grit trapped in their layers.

Step 1
Trim off the roots and the coarse dark green part of the tops. Don't throw them away - they’re great for adding to stocks.

Step 2
Cut the leeks in half lengthways.

Step 3
Wash under a running tap, fanning the layers and rinsing away any grit or soil trapped between them.

Step 4
Drain thoroughly and slice as required.