In a medium bowl, mix together the dry ingredients (flour, baking soda and baking powder, sugar, and spices) Melt the butter and whisk into the buttermilk. Pour into the dry ingredients and stir until just combined. The batter will be sticky. Drop by spoonfuls onto the fruit. Bake until the topping is golden, about 25 minutes. Serve topped with plain, unsweetened yogurt. Makes 12 servings.