Strawberry Rhubarb Scones are the perfect pastry for a springtime brunch. Buttermilk makes them impossibly fluffy and gives them a tangy flavor that compliments the rhubarb and berries. A generous sprinkling of turbinado sugar on top of before baking will yield a crunchy, glittering sugar crust. These can be made in a 9-inch round cake tin, but using a cast iron skillet will make irresistibly crisp scone edges.