In a large bowl, whisk the flour, sugar, and salt. Using a pastry cutter or your fingertips, work the butter into the mixture until most of it resembles coarse meal with some pea-size pieces. Form a well in the center. Sprinkle with 4 Tbs. of the ice water. Mix with your fingertips until the dough holds together enough to form a ball. If too dry, add the remaining water by the teaspoon, and mix until the dough comes together.