**Leeks tend to have dirt hiding all over between the layers. I find it works best to chop the leeks and then let them soak in a bowl of cold water to release the dirt, then rinse well in a sieve under running water.
Adapted from The Unofficial Downton Abbey Cookbook by Emily Ansara Baines
Find it online: https://kitchenjoyblog.com/creamy-cheddar-russet-leek-soup/