It doesn't take much time to whip up the glaze for the berries. Puree some berries then cook them with cornstarch, sugar, low sugar pectin (it's important to get the the pink box), and salt, then stir in some fresh lemon juice and let it cool. It's important to use these 2 thickeners. CI did a lot of tests with various thickeners alone and in combinations to determine which would make the tastiest pie. After it cools, add the other berries to the glaze and then arrange in the baked pie crust.