Scones (Scotland)

2 cups sifted flour
3 teaspoons baking powder
1 teaspoon salt
2 tablespoons granulated sugar
1/3 cup butter
1/2 cup buttermilk
1 egg
Granulated sugar

Mix and sift dry ingredients. Cut in butter with a pastry blender. Add buttermilk to egg, reserving 1 tablespoon of the egg white. Beat until blended. Pour into dry ingredients all at once. Stir. Mix to moisten. Toss dough on a lightly floured bread board. Pat lightly and roll 3/4-inch thick. Cut in squares or rounds with a floured knife. Beat remaining egg white with 1 teaspoon water. Brush each scone with mixture. Sprinkle with sugar. Bake on a cookie sheet at 425 degrees F for 10 to 15 minutes, until golden brown.