01 - Set oven temperature to 400°F (200°C).
02 - Fit the unbaked pie crust into a 9-inch pie pan and crimp edges as desired.
03 - Pour 1 1/2 cups water directly into the prepared pie crust.
04 - In a mixing bowl, combine 3/4 cup granulated sugar and 3 tablespoons all-purpose flour until evenly distributed. Sprinkle this mixture over the water in the crust.
05 - Drizzle 1 teaspoon vanilla extract and a pinch of salt over the top. Slice 4 tablespoons unsalted butter into thin pats and place evenly across the surface.
06 - Place the filled pie pan on the lower oven rack. Bake for 30 minutes at 400°F (200°C).
07 - Reduce oven temperature to 375°F (190°C) and continue baking for 20 minutes, until the crust is golden and the filling is set but retains a slight jiggle.
08 - Remove the pie from the oven. Let cool to room temperature, then refrigerate for a minimum of 2 hours to achieve the ideal texture before slicing.