Freeze butter for 10 minutes or until very cold.
Working on a cold surface, use a sharp knife to cube butter.
In a large mixing bowl, combine flour, sugar and salt. Add ice cold cubed butter, tossing to combine. Working quickly to avoid warming, use your hands to break up butter into smaller pieces, like coarse sand or small peas. I make all doughs by hand, but you may also use a food processor for this as long as you avoid over-mixing.
Drizzle a few spoonfuls of iced water in mixture and toss to moisten. Continue adding remaining water until dough is crumbly but holds together when squeezed with fingers. To ensure a flaky crust, work quickly and do not over-process.
Transfer dough (still crumbly) onto a piece of plastic wrap. Once wrapped, lightly form dough into a thick disk.
Refrigerate 1-2 hours (and up to 3 days).