Combine flours and salt in a food processor. Add cold, cubed butter and pulse until the mixture resembles medium-grind cornmeal, with a few pebble-sized pieces of butter remaining.
Transfer mixture to a bowl. Add vinegar and ¼ cold water. Mix with a fork until everything just comes together. Gently knead the dough with your hands until no dry bits remain. Not overworking your dough is key to a flaky crust.
Shape the dough into a disk, cover with plastic wrap, and transfer to the refrigerator. Chill for at least 30 minutes before rolling out.
At this time, prepare your filling ingredients, if needed. See notes for some filling ideas.
Preheat oven to 425F. Remove the chilled dough from the refrigerator, unwrap the plastic, and roll out into a 14" circle (try to aim for around ⅛" thickness).
Transfer the rolled-out dough onto a baking tray. Top with fillings of choice (refer to the tips in the above blog post).
Bake for 30-40 minutes, until crust is golden brown and crisp, and the filling is cooked through.