Start by cutting the vegan butter sticks into small cubes. Cover and refrigerate until ready to use.
Next, combine the flour, salt, and sugar in a bowl. Whisk to combine and then add the cold butter cubes.
Use a fork to mash the butter into the flour. You can also use clean hands to gently squish the butter and flour together to incorporate.
Stop mixing when a shaggy dough appears with some chunky pieces of butter in pea and almond sized shapes.Tip: If the pieces are too small/uniform the crust won't be as flakey. Make a well in the center of the bowl and add the cold water. Start with 6 tbsp and add another if needed. Mix for just long enough to bring the dough together into a crumbly mixture (it doesn't need to stick together yet) and then turn it out on to a lightly floured countertop.
Gently knead the dough just long enough to bring it together and then stop. You don't want to over work the dough at this point or the crust won't be tender and flakey. Shape the pie dough into a ball, working quickly so that the butter doesn't get too soft.
Tip: If at any point the butter starts to get soft, melty or shiny, place the whole bowl in the fridge for 5-10 minutes to prevent the butter from softening too much.
Cut the dough into 3 pieces. Form 1/3 into a small disk and wrap tightly with cling wrap. Then combine the remaining 2 pieces and form into a larger disk. Wrap tightly and refrigerate both disks of dough for at least 1-2 hours.