Roll out the pie crust, and press it into the pie dish. Trim and crimp the edges into whatever design you prefer. Use a fork to poke holes in the bottom of the crust.
Place a sheet of parchment paper or aluminum foil on top along with some baking beans or pie weights.
Bake at 400°F for 8 to 10 minutes then remove the baking beans and foil or parchment paper. Remove weights and bake for 2-3 more minutes.
Pour in the water, sugar and flour into the baked crust.
Gently stir the flour until there are no dry spots on top and the ingredients are dissolved.
Add the vanilla, cinnamon and salt and gently stir once again.
Gently lay the sliced butter on top of the pie.
Bake at 400°F for 35 to 45 minutes or until the center of the pie jiggles only slightly when moved.
Let the pie cool for at least three hours before slicing and serving with vanilla ice cream if desired.
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