Beat together shortening, sugar, juice and eggs. combine flour and baking powder; stir into egg mixture alternately with milk. Add peel, nuts and blueberries; mix just until blended. Spread in greased 8 x4" loaf pan and bake at 350 degree oven for 1 hour or until done. Cool for 10 minutes. Mix 2 T lemon juice and 1/4 c. powdered sugar. Drizzle over bread after removing from pan.