Ok, for the inquiring minds who want to know:
Fiddleheads are the young coiled fern leaves (about an inch in diameter) of the ostrich fern (Matteuccia struthiopteris). Nearly all ferns have fiddleheads, but those of the ostrich fern are unlike any other.
Fiddleheads are a Maine delicacy that appears in the early spring during April and May. Harvest the tender little rolls of fern almost as soon as they appear within an inch or two of the ground. Carefully brush out and remove the brown scales. Wash and cook the “heads” in a small amount of lightly salted boiling water for ten minutes, or steam for 20 minutes. Serve at once with melted butter. The quicker they are eaten, the more delicate their flavor. They may be served, like asparagus, on toast. Cooked, chilled fiddleheads can be also served as a salad with an onion and vinegar dressing.
A spring favorite: fresh wild salmon and fiddleheads or a nice fresh wild salmon and fiddlehead pie.
And there you have it.