Damson Plums?

Apparently they make the best jam. I have a jar of Bonne Maman Damsonplum Preserves sitting in front of me and to be honest, I preferred the one made by Jackie's Jams (both can be found at Whole Foods). Maybe it's the fact that Bonne Maman's conains 4 more grams of sugar than Jackie's Jams. I am asian, after all. Still, plum jam is delectable. You should buy some. They're pretty uncommon, though.