This recipe for a humble one-layer cake has been swooned over for decades. We call it "The Everything Torte", as it suits practically any occasion, can be baked in a variety of pan shapes, and is delightful when made with most any juicy fruit in place of the plums. I've tried apricots, nectarines, cherries, berries, pears, & jammy Concord grapes, all with success. Sometimes I cut bigger fruits into generous wedges, but grapes and pitted cherries and berries should be left whole—the fruit plays the starring role here. Each time, the same baking magic happens: the cake rises, the fruit turns jammy and partially sinks into the batter, and the torte emerges from the oven golden brown and fragrant. The torte is pretty baked in a 9 or 10-inch fluted tart pan, and I've even made it in a Pyrex pie dish and a standard loaf pan.
2-3 teaspoons unsalted butter
1 tablespoon flour115g unsalted butter, at room temp (½ cup)
150g granulated sugar (¾ cup)
½ teaspoon kosher salt
1 lemon, zest of whole, juice of ½
2 large eggs, at room temp (about 100g)
½ teaspoon vanilla extract
*125g all-purpose or GF Flour (1 cup)
1 teaspoon baking powder
450g Italian plums, pitted and halved (8-12)
½ teaspoon ground cinnamon
Turbinado or other coarse sugar, for sprinkling