Have you ever wondered why restaurants have nightly specials? There are many reasons, actually, but they all have one thing in common: spontaneity. Nightly specials are a way to cook with seasonal fruits and vegetables, the catch of the day, unexpected leftovers, and spur-of-the-moment market finds. They are also a way for chefs to experiment with exciting new ingredients, develop their own signature dishes, and road-test new ideas that may eventually...