Aluminum foil is a Penny Hoarder’s BFF when it comes to preserving leftovers. But if you’re just using that handy foil to wrap up day-old food, you’re totally missing out on so many other uses for this extraordinary kitchen standby. You might be dating yourself if you are still calling the kitchen workhorse “tin foil” though it’s not uncommon to hear that phrase. Foil was made of tin until just…