Those appear to be fiddlehead ferns.
Correct!
"Served with fiddleheads and grilled nantes carrots and washed down with crisp chardonnay, this was a perfect light summer dinner. The blue marlin was fresh, and good fresh fish doesn’t need much to taste delicious; so the salt, pepper, lemon combo did the trick."
http://foudefoodmtl.com/eatsathome/grilled-blue-marlin-steak
