Two weeks. That's all you get. Every May, Maine's forests give up fiddlehead ferns for about 14 days before they're gone until next year. The Wabanaki people knew this long before anyone else did — they've been harvesting ostrich ferns from the Maine woods for centuries. What started as survival food after a brutal Maine winter is now showing up on restaurant menus from Bangor to Portland, Oregon. Tossed in brown butter, pickled, blanched with lemon — next to seared scallops. That's a Maine thin