You will love this soup prepared with fresh or frozen fiddlehead.

In a medium saucepan, melt the butter and cook the onions 5 Minutes.
Remove saucepan from heat, mix in the flour and cook 1 Minute on low heat.
Add the chicken broth, stirring constantly, bring to a boil, reduce heat and cook on medium heat until the soup thickens lightly.
While the first preparation cooks, cook the fiddlehead in salted boiling water until tender. Drain and puree the fiddleheads in a blender or food processor with a little of the soup mixture. Return this mixture to the soup. Mix cream and cornstarch, add to the soup and simmer for a few minutes.