Sift flours with xanthan gum, baking powder, salt and sugar.
Add butter and incorporate it into flour until it is pea sized,
add ice water. Mix just until mixture holds together when
Wrap dough up in plastic wrap and refrigerate for 2-4 hours.
When you remove dough from the refrigerator, the moisture
should have distributed itself into the dough and now it is
ready to be rolled out. Use some extra flour and roll dough
out for the recipe you need it for.