Pie Crust

I got this recipe from my good friend Sharilyn in Moscow.  We picked fresh apples and then made pie with them, I still remember how yummy it was.  This is the best pie crust I have tasted.
4 1/2 cups flour
1 tsp baking powder
1 tsp salt
2 T. sugar
Mix above ingredients then add:
2 cups shortening (cut into mixture)
Mix then mix in a 3/4 cup measuring cup:
1 egg
1 T. vinegar
Enough Water to fill rest of cup (3/4 measuring cup)
Makes 4 9" crusts