My neighbor has a variety of fruit tress in his yard, and is very generous with the fruit, always giving us as much as we want. About this time every year, we end up with lots of kumquats. They're sour little buggers if you eat them like an orange, and sadly they usually just sit in the fruit bowl until they go bad. I just don't know what to do with them.
So, I've searched Pinterest, and found only a handful of ideas.