Cut the butter into ½ inch pieces and place in the freezer for 15–30 minutes.
Add ice cubes to the water so it becomes very cold.
In the bowl of a food processor, combine flour, sugar, and salt. Pulse several times to combine. Add butter and vinegar and pulse until the mixture resembles a course meal with some pea-sized pieces of butter. With the machine running, add water, a little at a time, until the mixture starts to clump together. If you squeeze some of the mixture in your hand and it holds together, you have enough water.
Divide the dough into two equal pieces, form into disks, wrap in plastic wrap, and refrigerate for 1 hour. Can be made several days in advance.