As soon as I mentioned jam, my cherry plums got busy performing. I have a feeling they were trying to convince me of their unique abilities so that I wouldn't cook them. But alas, they went in the pot anyway.
My son and I had lots of fun making jam! Here are a few pictures. Unfortunately the only jars I had were purple, so the results weren't as pretty as they would have been in clear jars. So I probably won't paint them, as many of you suggested. But rest assured it will all be eaten!