Step 1 Heat the oven to 400 degrees.
Step 2 In the bowl of an electric mixer or food processor, combine the all-purpose flour, cake flour, sugar and salt. Distribute the butter over the top and mix until the butter is thoroughly incorporated and the mixture resembles moist cornmeal.
Step 3Combine the ice water and vanilla and sprinkle over the top of the dough. Mix until the dough comes together and pulls cleanly away from the sides of the bowl.
Step 4Remove the dough from the bowl and flatten it into a disk, then wrap it in plastic wrap and refrigerate until ready to use.