Cook pie shell per directions on package, let cool.
In a food processor, blend the ice cream and two cups of blueberries.
Pour blueberry frozen dessert mixture into cooled pie shell.
Place pie into freezer until pie is frozen throughout.
In a sauce pan over medium heat combine 2 cups of blueberries, sugar, lemon juice and lemon zest.
Stir blueberry mixture until blueberries reduce slightly in size and the mixture becomes fragrant.
Using a mesh strainer, separate the blueberries from the juice. Keep juice aside for later.
Before the strained blueberries cool, add in the final ½ cup of fresh blueberries.
Remove frozen pie from freezer. Place cooled blueberry mixture on top. Put pie back into freezer until mixture is completely frozen.
Once pie is frozen, remove from freezer and slice. Drizzle slices with the reserved strained blueberry sauce.