This recipe for a humble one-layer cake has been reprinted and swooned over for decades. I call it "The Everything Torte", as it suits practically any occasion, from dinner party to simple breakfast. Substitute almost any juicy fruit for the plums. It's pretty baked in a 10” fluted tart pan, and I've even done it in a Pyrex pie dish and a standard loaf pan. It freezes well after baking, too.
2-3 teaspoons unsalted butter
1 tablespoon flour*125g all-purpose or GF Flour (1 cup)
1 teaspoon baking powder
½ teaspoon kosher salt
115g unsalted butter, at room temp (½ cup)
1 lemon, zest of whole, juice of ½
150g granulated sugar (¾ cup)
2 large eggs, at room temp (about 100g)
½ teaspoon vanilla extract
450g Italian plums, pitted and halved (8-12)
½ teaspoon ground cinnamon
Turbinado or other coarse sugar, for sprinkling