You’ll need to chill the crust for 15 minutes before baking it. The key to a flaky crust is keeping the dough nice and cold. Chilling the dough stops the butter from melting too fast once it’s in the oven. The end result is a buttery and flavorful melt-in-your-mouth crust.
For this recipe, you’ll also be blind baking (AKA parbaking) the crust. That means the crust gets a little baking time before you add the filling. The reason we do this is so the crust cooks all the way through, including on the bottom. If you’ve made pies before and noticed that the middle of the crust comes out under-done sometimes, parbaking prevents that.