Heat oven to 425°F. In medium bowl, mix 1 1/2 cups flour, 2 tablespoons sugar and the salt. Cut in 1/2 cup butter, using pastry blender, until particles are size of small peas. In small bowl, mix egg and 2 tablespoons of the water; sprinkle over flour mixture, 1 tablespoon at a time, tossing with fork until all flour is moistened and dough almost leaves side of bowl (up to 1 tablespoon more water can be added). Gather dough into a ball; shape into flattened 5-inch disk. Wrap in plastic wrap; refrigerate 30 minutes.