In a large bowl, whisk together the flour, sugar, and salt. Quickly grate the butter into the flour mixture using the large holes of a box grater.
Gently stir the butter into the flour mixture, tossing to coat. Do not mix the butter in - you want to keep it in large pieces.
Drizzle the ice water over the mixture, mixing with a fork until the dough starts to come together into a shaggy mass. Pour the dough out onto a work surface and knead lightly until it forms a ball.
Flatten the dough into a disk and wrap tightly in plastic wrap. Chill for at least 30 minutes.
Unwrap the dough and place onto a lightly floured surface. Roll dough away from you into a long rectangle, about 3 times longer than it is wide and about 1/2 inch thick.
Fold the dough into thirds: Start by folding the top third down toward the middle of the dough, then fold the bottom third up over the folded dough, like a letter. Give the dough a quarter turn, roll out again into a long rectangle, and fold in thirds in the same fashion. Wrap the dough in plastic and chill for another 30 minutes.
Repeat this rolling and folding process twice more, chilling for about 30 minutes in between. After the final roll, chill the dough thoroughly.