In the bowl of a food processor, place the flour, salt and sugar. Pulse for a few seconds. Add the butter and pulse, a few seconds at a time, until the mixture has a grainy texture. Add the ice water and vinegar. Pulse again, a few seconds at a time, adding a little water, if necessary, until the dough begins to form a ball. Remove the dough from the processor. Form a ball with your hands. Cover in plastic wrap. Refrigerate for 30 minutes. Roll out the dough and line a 23-cm (9-inch) tart pan with a removable bottom. Refrigerate again for 30 minutes.
