For the pie crust: Take whole wheat flour, salt and sugar in a bowl and mix well.In a separate bowl, thoroughly whisk oil with cold water and pour it into the flour all at once.Incorporate it to the flour with your hands to get a crumbly texture. If the mixture seems too dry to be gathered, sprinkle some more water and gather it to a dough.You can add herbs at this stage,if you wish to.Do not over knead that it will stop you from getting a lovely flaky crust in the end.Once the dough is ready, refrigerate it for an hour.