Marianne's Pie Crust

I'm still working with this recipe;  my mother made the BEST pie crust and this is her recipe. I have successfully substituted butter for the shortening, but if you use salted butter you need to reduce the amount of salt by probably half.

Pie Crust 

2 c. flour 
2/3 c. shortening 
1 t. salt 
1/4 c. ice water                                 

Mix flour and salt together.
Save out 1/3 c. of the flour/salt mixture and mix with the ice water,
forming a paste.  Cut the shortening into the remaining flour/salt mixture.
When the texture of rice is obtained, add the flour/water paste.
Mix well and chill.