To make the dough: In a stand mixer with paddle attachment/or in a food processor, mix together flour, sugar and salt. Add the chilled butter and mix until the butter is broken into the size of large corn kernels. Its O.K is there are a few pieces that are larger, they will make the dough nice and flaky.
Add the ice water all at once and mix until the dough JUST begins to hold together. Turn the dough out on a clean work surface and shape the dough into a 5-inch disk and cover with plastic wrap. Refrigerate for at least 30 minutes until nice and firm.