In a food processor combine the flour, salt, sugar, and butter. Pulse until the mixture resembles coarse meal with a few pea-size pieces of butter.
Add the cold water, ¼ cup at a time, until the dough comes together. Do not over mix. Take the dough out of the food processor and lightly knead to bring it all together. Wrap in plastic wrap and place in the refrigerator for at least one hour.
Preheat an oven to 375°F. Roll out the pie crust and place in a deep pie baking dish. Place a piece of parchment paper on top of the crust. Fill it with weight (a smaller baking dish or dry beans) to help keep the crust from rising. Bake for 20-25 minutes.
Remove the weight and the parchment paper and return to the oven for another 5-10 minutes or until the crust is golden brown. Allow the crust to cool before adding the chocolate filling.