Summer Time is Zwetschgenkuchen time for me. This traditional German Plum Cake will be made with Damson Plums on a yeast dough. After your first mouthful of this juicy cake you will be addicted to the wonderful flavors of plums, cinnamon, yeast dough and whipped cream. I can't wait to get the first plums (Zwetschgen) every year to make one of my favorite fruit cakes.