Buttermilk Barley Biscuits

The best biscuits are often made with fine low-protein wheat flours. Whole-grain barley flour is also quite fine and low in gluten, so it creates a lovely, light biscuit that's a bit more wholesome than a biscuit made purely from all-purpose flour (we combine them in equal parts). This recipe appears in our cookbook, "A New Way to Bake" (Clarkson Potter).