1.In a large bowl combine 2 cups flour,sugar,baking powder,baking soda, lemon zest and salt. Stir to combine.

2. With a pastry blender cut the shortening into the flour mixture until it resembles coarse crumbs.

3. Whisk the slightly beaten egg and buttermilk together and stir into the flour mixture. Stir in frozen blueberries.

4. Flour a work surface with the remaining 1/4 cup of flour, place dough on flour, with flour coated fingers gently knead the dough 6 or 7 times just until the dough begins to hold together.

5. Pat dough into either a rectangle or round 1/2 inch thick ( your preference). Cut out rounds with a 2 inch biscuit cutter. Lightly grease a cookie sheet, place cut biscuits 2 inches apart, place cookie sheet on middle rack in oven. Bake at 400 degrees for 15 minutes or until lightly browned. Combine topping ingredients and brush onto warm biscuits.