Why It's A Mistake To Slice Into That Fresh Apple Pie Too Early - Tasting Table
Briefly

Resting your pie after baking is essential for achieving the perfect texture. Without proper cooling time, the filling won't set, resulting in a soggy, messy slice.
For optimal results, let your apple pie rest for at least four hours after pulling it from the oven. This allows the filling to solidify and enhances the flavor.
Read at Tasting Table
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