1½ cups flour
1 cup whole wheat flour
1 tablespoon brown sugar
1 teaspoon salt
2 sticks unsalted butter, cold and cut into small pieces
2 to 4 tablespoons ice water
In a large bowl, combine flour, whole wheat flour, brown sugar and salt. Cut in butter with two forks or a pastry blender until mixture resembles coarse crumbs. Add ice water (1 tablespoon at a time), mix until dough just comes together. If dough is too dry, add more water, 1 tablespoon at a time.
Turn out dough from bowl onto work surface, and knead once or twice to combine. Divide dough in four equal parts. Shape into disks. Wrap in plastic wrap, and refrigerate for at least 30 minutes.