Amazing Plum Cake

Here in Boston we are blessed with a multitude of Farmers Markets. There is literally one every day of the week, within a reasonable distance. At this time in the season, there are copious amounts of lettuce, tomatoes, corn, and peaches at the markts. And they are all great. But the farm good that has caught my eye (mouth?) this summer are these little plums. I have bought them now from several markets around the city, from several different farms, week after week. I started with the most yellow and orange little guys, and then worked my way towards the more traditional purple ones, and then back to yellow again.