1 1/2 c  All purpose flour
1/2 c  Potato flour
1/4 ts Salt
2 tb Margarine, softened
1/2 c  Walnuts, finely chopped &
-- toasted
3/4 c  Iced water
Salt for the tops, optional

Preheat oven to 350F. Mix flours & salt together in a large bowl. Cut in
the margarine until the mixture resembles coarse breadcrumbs. Add walnuts &
stir until they are evenly distributed in the flour. Blend in enough water
to form a cohesive ball. Add more water if necessary. The dough should be a
little sticky. Wrap dough in waxed paper & chill for at least 1/2 hour.
Divide into 2 equal portions. Roll out to 1/8″ thickness. If desired,
sprinkle tops with salt & roll over with rolling pin. With a round cookie
cutter, cut into 2″ rounds. Place onto a lightly greased cookie sheet &
prick with a fork. Bake for 25 to 30 minutes or until lightly browned. Cool
on a rack. Serve with spreads.