Measure flour, sugar, salt, and baking powder into large bowl.
Mix thoroughly and cut in lard until dough is the size of tiny peas.
Break egg into 8 ounce measuring cup. Beat with a fork, then pour in vinegar.
Add enough cold water to reach the top (you will have a total of 1 cup liquid).
Pour over flour mixture a little at a time, tossing and stirring with a fork until all liquid is absorbed.
Shape dough into a ball, then divide into four equal portions. Wrap tightly. Can be stored in refrigerator up to 2 weeks, or freezer up to 6 months. Each portion will make 1 double crust pie.