Rhubarb -- spring's red celery stalk fruit (or is it vegetable?) -- only gets the spotlight for a few short weeks before sweeter strawberries and other seasonal delights vie for center stage. It has earned that spotlight, however fleeting, with its tart and bracing flavor that works well in so many recipes. Long destined for pies, it yearns to break free. Help rhubarb achieve greatness with these seven recipes.