Toss the flour and cold butter cubes in a bowl. Cut the butter into the flour until the mix looks like coarse sand with some pea-sized butter pieces.

Drizzle in 6 tablespoons of ice water and toss with a fork. Add more water a tablespoon at a time just until the dough sticks together when pressed.

Gather the dough into a ball, divide it in half, and flatten each half into a disc. Wrap tightly and refrigerate for at least 1 hour.

Roll one disc into a 12-inch circle on a floured surface, transfer it to a 9-inch pie plate, trim the edge, and crimp. Use immediately or chill until ready to bake.