Make-Ahead Blueberry Pie
The crust split. Blueberries burned on the oven floor. The soupy filling required a spoon to eat. How could freezing an unbaked pie cause so much aggravation?
Why This Recipe Works
Minute Tapioca outshone other thickeners we tested for our Make-Ahead Blueberry Pie. During the freezing and thawing, water was squeezed out of the starch gel, causing soupy filling, and, consequently, soggy crusts. Different starches have varying freeze-thaw stability properties, and tapioca survived the process best.
Achieving a flaky crust was our biggest challenge. Dried fruit added to the filling helped absorb some of the fruit juices, which kept the filling from being soupy. Because dried blueberries were expensive and hard to find, we preferred dried cranberries, which added a faint tart complement to the blueberries in the filling. Sprinkling graham cracker crumbs on the bottom of the crust and on top of the filling also combated a soggy bottom and produced flaky and tender crusts. Plus, the crumbs melded into the filling and disappeared. Whatever you do, don’t defrost Make-Ahead Blueberry Pie before baking it—that guarantees a soggy crust.