Countertop yogurt-making is simple and tasty. You only need a culture and countertop to make an easy batch every day. This variety of yogurt is an heirloom culture that can last for generations with basic care.
If you have a persimmon tree (or at least a bunch of persimmons), how about drying them the traditional Japanese way, by skinning and hanging to air-dry? They turn into jam-like dates. It's called Hoshigaki, and it's fun AND delicious.