1. Preheat the oven to 375°F (190°C). Butter an 11½ × 8in (29 × 20cm) baking dish. Combine the peaches, blueberries, sugar, and lemon zest in the dish.

2. Sift the flour, 1/3 cup of the sugar, baking powder, and salt into a bowl. Add the butter and rub it in with your fingertips until the mixture resembles coarse bread crumbs.

3. Beat the buttermilk and egg together. Stir into the flour mixture to make a soft, sticky dough. Drop walnut-sized spoonfuls of the dough over the fruit, leaving a little space between each one. Sprinkle with the almonds and the remaining 1 tbsp of sugar.

4. Bake for 30 minutes, or until the topping is golden brown and the juices are bubbling and a wooden toothpick inserted into the topping comes out clean. Let cool briefly and serve hot or cooled until warm.