4 medium ripe peaches or 1 pound (3 1/2 cups) frozen sliced peaches, defrosted and drained
1 1/2 cups (210 grams) fresh sweet cherries, pitted and halved; or frozen cherries, defrosted, drained and halved
3 tablespoons honey, divided
1 teaspoon finely grated lemon zest
1 tablespoon fresh lemon juice
1 tablespoon cornstarch
3/4 cup (90 grams) whole-wheat pastry or white whole-wheat flour
3/4 teaspoon baking powder
1/4 teaspoon baking soda
Pinch fine salt
3 tablespoons (42 grams) very cold unsalted butter, cut into small pieces
1/2 cup (120 milliliters) well-shaken buttermilk, low-fat or whole
2 tablespoons neutral oil, such as avocado or canola
1 1/2 teaspoons demerara sugar (optional)