Celeriac. It's not going to win any beauty contests, but don't let its appearance fool you. Also known as celery root, celeriac is coming into season now and can be used both raw or cooked.

Try mashing boiled celeriac and adding it to casseroles; it's a nutritious and low-calorie way to extend some of your favorite comfort foods. You can also enjoy mashed celeriac in lieu of or mixed in with mashed potatoes -- the flavor is light and pleasant. Or, opt for raw preparations; celeriac is great in cole slaw. You can also slice or cube celeriac for stews and soups, and roasted celeriac makes a great side dish.

Check out this slideshow for some more of spring's nutritional superstars.