Preheat oven to 375°F and butter a 9x9-inch baking dish.
In a large bowl, combine sliced apricots, 3/4 cup sugar, cornstarch, and lemon juice. Toss well and transfer to prepared baking dish.
In a medium bowl, whisk together flour, 1/3 cup sugar, baking powder, and salt. Cut in cold butter until mixture resembles coarse meal.
Add buttermilk and almond extract, stirring just until dough comes together.
Drop large spoonfuls of dough over the apricot mixture, spacing them slightly apart. Sprinkle coarse sugar over the top.
Bake for 35-40 minutes until the topping is golden brown and the fruit is bubbling around the edges.
Cool for at least 15 minutes before serving to allow the juices to thicken slightly.