Into large bowl of electric mixer, sift together flour, confectioners' sugar
and salt; add shortening, vanilla and chopped walnuts; using low speed, mix
all ingredients until just blended. Roll dough on floured counter into
1-1/2" cylinders. Refrigerate for at least 30 minutes until firm enough to
slice. Preheat oven to 350F. Line cookie sheets with parchment paper.
Remove dough from refrigerator; slice into 3/8" thick slices; place on
prepared cookie sheets. Bake for 10 minutes. Cookies should be white, if
they turn brown, reduce cooking time