Place the flour in a food processor along with the salt and sugar. Pulse a few times to combine.
Add the coconut oil and pulse again to combine. The flour should begin to clump together slightly in a sandy texture but will be too dry to form a ball of dough.
While the processor is running, add the water a tablespoon at a time until the dough just about holds together. Try not to overhydrate the dough. Remove the dough from the processor, wrap in clingfilm or ecowrap and pop in the fridge for a good half hour.
Once cool, take the dough out of the fridge and dust a clean surface with flour. Roll out the dough into a circle large enough to overlap your pie tin by a good inch and a half. Lay the pastry over a rolling pin and gently lower it onto the pie tin. Push gently into place making sure there are no air bubbles and crimp the sides. Wrap and refrigerate for another 20 minutes. Preheat your oven to 180c.
Once the Pie Crust is chilled, remove it from the fridge. Prick the base with a fork and line the crust with baking parchment. Fill with baking beads and then cover the edges of the crust with tinfoil to keep them from burning.
Bake for 10-15 minutes. If you can, peel under the Pie weights to check that the base is cooked. If it needs an extra 5 minutes then go ahead, if not, remove and allow to cool fully.