I am unfamiliar with leeks, can you tell me more about them?

Leeks, known scientifically as Allium porrum , are related to garlic, onions, shallots, and scallions. Leeks look like large scallions, having a very small bulb and a long white cylindrical stalk of superimposed layers that flows into green, ...

from The World's Healthiest Foods http://ift.tt/1RHKFBP