Crust

In a medium sized bowl combine the flour, sugar and salt. Mix the butter into the flour mixture until there are no lumps larger than a pea. Add the egg yolk and water and stir just until mixed. Wrap in plastic film and place in the fridge for at least an hour.

Filling

Put everything into a bowl and whisk until well combined and smooth. Set aside. 

Remove dough from fridge approximately 30 minutes before you intend to roll it. Preheat the oven to 425° F. Place the dough on a lightly floured surface and roll out to a ¼-inch thickness. Place and press into a nine-inch pie pan. Fill the unbaked pie crust with the filling and bake for 15 minutes. Turn the oven down to 350° F and bake for another 35 to 40 minutes. Take out and let cool. Garnish with whipped cream.