Transfer the dough to the baking sheet and press it into a 7-inch round, 1/3 inch thick. Prick the round all over with a fork and lightly sprinkle the top with sugar. Using the blunt side of a large knife, score the round into 8 wedges. Bake for 30 minutes, until golden brown and just cooked through. While the shortbread is still warm, cut through the score marks with a serrated knife to separate it into wedges. Serve warm or at room temperature.