Process the flour, butter, sugar and salt in a food processor fitted with a steel blade until butter is pea–size. Add the water and mix until dough gathers into a ball. Remove from machine, dust with flour, wrap with plastic wrap. Refrigerate 1 hour. Roll out the dough on a lightly floured surface. Line a 9 inch tart pan with the dough. Trim and crimp the edges. Prick the bottom of the dough with a fork. Freeze while preparing the filling.