Why? Because you can! And pickle, and jam, or otherwise celebrate the resurgence of the domestic arts our forebears held so dear. Put on your best apron and step into our kitchen, won't you?
Tweaking a family favorite. With enough wild plums to experiment, I tried one with added pectin, one with no pectin and (the big winner) plum and pineapple with 5 spice.
A recipe based on one from Linda Ziedrich's The Joy of Jams, Jellies, and Other Sweet Preserves. Her recipe is for Damson plums and does not include cardamon.