Makes a 9-inch cake, 8 servings Ingredients 1/4 cup (57g) salted butter1/3 cup (65g) brown sugar, firmly packed3 large plums, sliced 1/8-inch thick 1/2 cup (115g) salted butter, softened1/2 cup (100g) brown sugar, firmly packed1/2 cup (100g) granulated sugar2 large eggs6 tablespoons (75g) ...