In your food processor, combine 1 1/2 cups of the flour, salt, and sugar. Pulse a few times to mix.
Scatter cold butter cubes over the flour mixture. Pulse several times until the dough forms.
Add the remaining 1 cup of flour and pulse until the mixture looks like coarse crumbs.
Add cold water. Pulse until the dough comes together when pinched between your fingers. It should still look a bit crumbly in the bowl - don't wait for it to form a full ball.
Dump the dough onto a clean surface and press it together with your hands (just enough to hold it). Divide it in half, form each half into a disc, wrap tightly in plastic or beeswax wrap, and refrigerate for at least an hour (or up to 2 days).
