Plums call out for being cooked into something sweet. Last night it was an upside down cake for the yellow plums I bought at Sport Hill Farm Market in Easton, CT. First, cut the plums in half and remove the pits. Then let brown sugar and butter bubble in a 9-inch cast iron pan, until it becomes syrupy, and place halved plums in pan in one layer, round side down. Next, the light, buttery batter. Pour over plums. Put the skillet in the 350 F oven. Bake 35-40 minutes. Remove from oven. Let sit for 5 minutes, loosen edges of pan. Look for a large round flat cake platter and realize you don’t have one. No worries. Rectangular platter to the rescue.  Flip the cake onto the platter. The cake is light, rich, and the sweet layer of caramelized plums has a tart note. Even though I’m not a “dessert person,” I had two slices because how often do you have something this good?  This cake is dangerous.