Fiddlehead

Fiddleheads or fiddlehead greens are the furled fronds of a young fern,[1] harvested for use as a vegetable.
Left on the plant, each fiddlehead would unroll into a new frond (circinate vernation). As fiddleheads are harvested early in the season before the frond has opened and reached its full height, they are cut fairly close to the ground.[citation needed]
Fiddleheads have antioxidant activity, are a source of omega-3 and omega-6 fatty acids, and are high in iron and fibre.[2] Certain varieties of fiddleheads have been shown to be carcinogenic. (See bracken poisoning)
The fiddlehead resembles the curled ornamentation (called a scroll) on the end of a stringed instrument, such as a fiddle. It is also called a crozier, after the curved staff used by bishops, which has its origins in the shepherd’s crook.