time capsule - n : for preserving historical records to be discovered at some future time

I'm using this definition because it was the shortest one I found. My favorite time capsule is ............................................. THE FREEZER!

"What?," you say. Why the freezer? Oh, because in my freezer is some food that was prepared by Susan while she was here. MMMMMMMMMMmmmmm - I just ate some blueberry pancakes and loved them more than when they were first cooked.