In your food processor, combine 1 1/2 cups of the flour, salt, and sugar. Pulse a few times to mix.
Scatter the cold butter cubes over the flour mixture. Pulse several times until the butter is broken down and the mixture starts to clump together.
Add the remaining 1 cup of flour and pulse a few times, just until the mixture looks crumbly with small pieces of butter throughout.
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).