In a food processor combine the dry ingredients and the butter. Let the processor do its job for about 30 seconds until the butter has been broken down into tiny chunks. Then add the water a little bit at a time until the dough comes together to form a ball. Remove this from the food processor and wrap in plastic and let cool in the refrigerator for at least 30 minutes.
Once chilled roll the dough out to fit an 11 inch tart pan. Blind bake this in the oven (with a pie weight) for about 20 minutes and then remove.