In a large bowl mix the flour, sugar and salt together.
Grate the butter (or cut into small pieces) and place in freezer for 10-15 minutes.
Add the cold butter to the flour mixture and, using a pastry blender or two knives, cut the butter into the flour until it looks like coarse sand.
Add the ice water a little at a time until the pastry holds together in a ball.
Flatten the ball of pastry a bit, wrap in it plastic wrap, and let it rest in the refrigerator for at least an hour.
Recipe Notes
Pastry will be good in the refrigerator for up to five days. It can be frozen for as long as three months. Defrost in the refrigerator overnight and proceed as above.