Butter six 3½-inch tart rings or fluted tartlet molds. Preheat the oven to 400°F. With your hands, roll the pastry dough into a cylinder. Cut off rounds of dough, one at a time, as you line the rings. If the dough rounds are hard, pound them, giving them a quarter turn after each couple of poundings.
When the pastry dough is about ½ inch thick or it has softened, roll out the circles until 2 inches greater in diameter than a tartlet ring and from ⅛ to ¼ inch thick.