"Cold tomato-sauced spaghetti may seem the unlikeliest of leftovers unless you have tasted it baked into the firm, Italian-style omelet known as a frittata. Much more than mere kitchen frugality, a spaghetti frittata is a real treat and inspired this even dressier, on-purpose adaptation, worthy of a casual company supper. Serve a big, cheesy wedge of it accompanied by a crisp green salad and a hunk of garlic bread and pour a lively red wine...."