How to Make It
In a medium bowl, whisk together the flour and salt with your hands or a fork. Add the cubes of butter, tossing them together with the flour so that they’re well coated before rubbing the cubes between your fingers, breaking them up and smushing them into the flour; you don’t want the pieces to be too small—I like them to be about the size of walnut halves.
Fish the ice cubes out of your ice water, making sure you have 2/3 cup. Drizzle it over the flour mixture, then gently mix it together with your hands until you have a rough ball of dough; it should just come together—some errant crumbs are okay. Divide the dough in two and shape each portion into discs. Wrap each tightly in plastic wrap and refrigerate for at least half an hour or up to 2 days, or freeze for up to 2 months.