In medium bowl, mix flour, baking powder, baking soda, salt, sugar and orange
rind together. Using a pastry cutter or two knives, cut the shortening into
the flour mixture until it resembles coarse meal.
In small bowl lightly beat egg with fork. Add the buttermilk to the beaten
egg, then add it to the flour mixture. Using a fork, stir until just moistened.
Add the blueberries. Stir gently just to mix. Turn dough out onto floured surface
or cloth and gently knead 3 or 4 times. Roll out to 1/2-inch thickness. Cut
with biscuit cutter or into desired shapes. Place on lightly greased cookie
sheet and bake at 400 degrees F for 15 minutes or until golden.
Mix butter with sugar, cinnamon and nutmeg and brush onto tops of biscuits
as they come from the oven.