Leeks Basics: Leeks are a member of the onion family and are related to shallots, garlic, chives, and scallions. They have a sweet, delicate flavor all their own. Before using leeks, it is essential to clean them well, as dirt, sand, and grit can collect between the layers.
In Season: Leeks are available year-round in most regions.
What to Look For: Leek tops should be dark green and firm, not limp or dried out. The bulb ends should have fringes of small crisp-looking roots still attached; avoid split or soft bulbs, or those with large blemishes.
How to Store: Refrigerate leeks up to one week, loosely wrapped in plastic. Wait to trim the tops and roots until just before using.