Leek

The hidden grit

Leeks grow with their lower stems buried in soil to keep them white and tender (a process called blanching). The result: dirt and grit lodge between the tightly furled leaf layers. Cutting and rinsing without splitting first leaves grit in your dish — every leek must be split lengthwise and rinsed thoroughly before cooking.

The bottom 10–15 cm (the white-and-light-green portion) is the cooking part; the dark green tops are often discarded but can be saved for stock.

A milder allium

Compared to onion and garlic, leeks are milder, sweeter, and less pungent — closer to a cooked-onion mellowness even when raw. The same sulfur compounds that make onions sharp are present in leeks but at lower concentrations.

Where they shine

• Vichyssoise — the cold cream-of-leek-and-potato soup created by chef Louis Diat in 1917 at the Ritz-Carlton in New York. Despite its French name, it’s American.
• Welsh national vegetable — leeks are the symbol of Wales, traditionally worn on St. David’s Day.
• Cock-a-leekie — Scottish chicken-leek-prune soup.
• Flamiche — Northern French / Belgian leek tart.
• Greek prasopita — leek pie.

A long-cooking aromatic

Leeks soften beautifully under long, slow cooking — they melt into stews and braises, contributing sweetness without making the dish taste of leek. A bundle of leek tops in a pot of stock is a quiet aromatic addition.