Diva, Try this.
Fiddlehead Dijon
1-1/2 pounds fresh fiddleheads
1 tablespoon cornstarch
1 cup nonfat buttermilk
2 teaspoons Dijon mustard
3/4 teaspoon lemon juice
1/2 teaspoon dried tarragon
1/4 teaspoon pepper
Clean and prepare fiddleheads. Remove scales and wash thoroughly. Place fiddleheads in a vegetable steamer over boiling water. Cover and steam 20 minutes or until tender, but still crisp. Set aside, and keep warm.
Combine cornstarch and buttermilk in a small saucepan; stir well. Cook over medium heat until thickened and bubbly, stirring constantly. Remove from heat; stir in mustard, lemon juice, tarragon and pepper.
Arrange fiddleheads on a serving platter. Spoon sauce over fiddleheads. Serve immediately. Makes 6 servings.