Mom's Pie Crust 
Makes 2 pie crusts 

1 cup cold, unsalted butter OR 1/2 cup cold unsalted
  butter and 1/2 cup shortening OR 1 cup cold, unsalted
  margarine
3 cups all-purpose flour
3 tablespoons white sugar
1/3 cup cold water (approx.)
                   
1. Combine flour and sugar into the bowl of an electric
   mixer. Cut butter or butter and shortening into Tbl
   pieces; add it to the flour and butter. Use the paddle
   beater to cut the butter and flour together. Alternatively,
   this can be done by hand with a pastry blender. 
2. With the mixer on low speed , or while stirring the
   mixture with a fork, pour in the cold water. When the
   dough starts to clump, and before it turns into a ball,
   stop stirring. 
3. Lightly knead dough in the bowl until it forms a ball.
   Divide dough into two parts. Flatten each part into a
   disk, and chill for about 30 mins before rolling.