Alfredo sauce tends to separate in the fridge and doesn't always reheat well, but I've got a trick to bring the sauce back together. Add the pasta and sauce (heat any leftover steak separately in the microwave) to a baking dish with a splash of milk or heavy cream and give it a good stir. Cover with foil and heat for 10-15 minutes in a 350 degree F oven, stirring once or twice while it's reheating. The sauce comes back together like a dream!