To prevent the bottom of a fruit pie from getting soggy before it is baked, you can take a few pre-baking steps and use some handy tips to ensure a firm and not mushy crust. Here's what you can do:
Preheat the oven: Make sure your oven is fully preheated before you put the pie in. This allows the bottom crust to start baking immediately and set quickly.
Use a hot baking sheet or stone: Place a baking sheet or pizza stone in the oven while it preheats. Once you're ready to bake the pie, place it directly on the hot baking sheet or stone. The extra heat underneath will help to cook the bottom crust faster and prevent sogginess.
Par-bake the crust: If you're making a pie with a very wet filling, consider par-baking the bottom crust before adding the filling. To do this, roll out the pie crust, place it in the pie dish, and bake it for a short time (about 5-7 minutes) until it sets but doesn't brown. Then, remove it from the oven, add the filling, and continue with the regular baking process.
Use a pie bird or vents: If you're making a double-crust pie, use a pie bird or cut vents in the top crust. These openings allow steam to escape during baking, preventing excess moisture from accumulating inside the pie.
Avoid overfilling: Be mindful not to overfill the pie with too much fruit filling, as this can lead to excessive juices seeping into the bottom crust. Leave some space at the top to accommodate the filling as it cooks down.
Add a dusting of flour or breadcrumbs: Sprinkle a light layer of flour or breadcrumbs on the bottom crust before adding the fruit filling. This helps to absorb excess juices and prevent them from soaking into the crust.
Use cornstarch or tapioca as a thickener: When preparing the fruit filling, add cornstarch or tapioca as a thickening agent. These substances will absorb some of the fruit juices during baking, helping to keep the bottom crust firmer.
Choose ripe but not overly juicy fruits: Using ripe, but not overly juicy, fruits in your pie can help reduce the amount of liquid released during baking.
By implementing these tips, you can increase the chances of having a firm and well-baked bottom crust in your fruit pie, rather than a soft and mushy one.