Foolproof Pie Crust
["4 c. flour", "2 tsp. salt", "1 Tbsp. sugar", "1 3/4 c. shortening", "1 egg", "1/2 c. water", "1 Tbsp. vinegar"]
["Sift dry ingredients; add shortening and mix with fork until mixture looks like fine cornmeal, then add to egg, water and vinegar.", "Shape into 4 balls and chill before rolling."]
["flour", "salt", "sugar", "shortening", "egg", "water", "vinegar"]