Pflaumenkuchen, also known as Zwetschgendatschior is a wildly popular plum cake dessert in Germany. The yeasted dough bakes into something reminiscent of shortcake. The plums impart tart and sweet flavors as the fruit’s juices flow into the cake as it bakes. The recipe is classically made with ripe plums but this recipe works beautifully with other stone fruits like nectarines,…