In a mixing bowl, stir together flour, sugar, and salt. Cut in shortening until pieces are the size of small peas. Sprinkle water, 1 tablespoon at a time, over dry ingredients. Gently toss with a fork. Push to side of bowl. Repeat mixing in water until all is moistened. Stir in melted butter. Form dough into a ball (dough will be sticky). On lightly floured surface, roll half of dough into one 15-inch circle. Halve remaining dough. Roll each piece into an 8-1/2-inch circle.