Heat oven to 425°F. In medium bowl, mix flour, 1 teaspoon sugar, 1/4 teaspoon salt and the oil with fork until well mixed. Stir in milk, 1 tablespoon at a time, tossing with fork until all flour is moistened and pastry almost leaves side of bowl. Shape pastry into a ball, using your hands. Press pastry in bottom and up side of 9-inch glass pie plate; flute as desired or press pastry to top edge of pie plate with fingers or fork.