When you walk down the produce aisle of your grocery store, you see a lot of familiar fare. Potatoes, broccoli, carrots, they're all there. Once in a while, you see some exotic stuff like bok choy or rutabaga. But if you crave variety, something really gourmet, here's a treat you can grow in your own yard. You just may not recognize it as food, or at all. We're talking ostrich fern, or, more specifically, the baby fronds of ostrich ferns that are just about ready to open up in the spring. They're called fiddleheads.