In a medium bowl, stir together 1 cup flour, cornmeal, and salt. Using a pastry blender, cut in vegetable oil spread until pieces are pea-size. Sprinkle 1 tablespoon cold water over part of the flour mixture; gently toss with a fork. Push moistened dough to the side of the bowl. Repeat moistening flour mixture, using 1 tablespoon cold water at a time, until all flour mixture is moistened (3 to 4 tablespoons cold water total). Shape dough into a ball.