In a food processor, pulse together the flour, any dry flavorings, and butter until the mixture resembles coarse meal. (If working by hand, cut butter into flour, being careful not to warm butter as you work)
Begin adding water 1 Tbsp at a time until dough just comes together, pulsing or mixing as you go. If you are adding liquid for flavor, alternate with the ice water.
Turn out onto plastic wrap and form into a disc. Chill to firm, about 15 minutes.
Roll out with a heavy rolling pin and place in pie dish.