Whisk together the dry ingredients, then cut in the butter. Stir in the buttermilk until a dough ball forms. Set aside.
1
Mix the berries, sugar, lemon juice, and cornstarch separately.
2
Pour the mixture into a baking dish. Drop the dough by rounded spoonfuls onto the berry mixture. Coat the dough with an egg wash and sprinkle with turbinado sugar.
3
Bake and let cool.
4