Ôfficial•Leek "Where good sound is served" Est. 2014 Leek 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. How to cook Turnt the heat up.