1. Preheat oven to 400°F.
2. Mix the first four ingredients in a bowl.
3. Cut in shortening.
4. Add lemon rind.
5. Add egg and milk and work in gently and quickly with hands.
6. Add blueberries and gently fold in (dough will be sticky).
7. Pat into round one inch thick on a baking sheet (I usually put cold water on my hands to prevent sticking) score (like a pie) into 8 pieces.
8. Brush with milk and sprinkle with sugar.
9. Bake 15 minutes or until slightly golden-do not over bake.