In a large bowl, cream shortening and brown sugar until light and fluffy. Beat in eggs and vanilla. Combine the flours, baking powder, baking soda, cayenne and pepper; gradually add to creamed mixture and mix well. Stir in cashews (dough will be crumbly). Refrigerate for 30 minutes or until easy to handle.
Shape into four 8-in. logs; wrap in plastic. Refrigerate 1 hour longer or until firm.
Unwrap dough; gently cut into 1/4-in. slices. Place 2 in. apart on greased baking sheets. Bake at 325° for 12-16 minutes or until golden brown. Cool for 1 minute before removing from pans to wire racks to cool completely.
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