Process flour, salt, and herbs (if using) in a food processor until combined. Add butter, and process just until mixture resembles coarse meal. Whisk together egg mixture and the water in a small bowl. With processor running, pour in egg mixture; process until dough starts to come together. Shape dough into a disk. Wrap in plastic wrap, and refrigerate at least 30 minutes.
Can this be made ahead of time ... as in a week ahead if need be?