In a large mixing bowl, combine flour, brown sugar, ginger, cinnamon, baking powder, salt, soda, nutmeg, and cloves. Using a pastry blender, cut in butter until mixture resembles coarse crumbs. Make a well in center of flour mixture; set aside.
In a medium mixing bowl, combine eggs, pumpkin, currants, buttermilk, and vanilla. Add egg mixture all at once to flour mixture. Stir just until combined. Do not overmix.
Drop dough in 1/4 cup portions 2 inches apart on ungreased baking sheets. In a small bowl, combine beaten egg white and water. Lightly brush egg white mixture over the scones and sprinkle with granulated sugar. Bake in a 400 degree F oven for 12 to 14 minutes or until lightly browned. Remove scones from baking sheet; serve warm. To reheat, wrap scones in foil, heat in a 400 degree F oven for 5 to 8 minutes. Makes 20 scones.