In a large bowl, cream the shortening, peanut butter and sugars until light and fluffy. Add the eggs, one at a time, beating well after each addition. Beat in vanilla. Combine the flour, cocoa, baking soda and salt; gradually add to the creamed mixture and mix well. Stir in cashews.
Roll into 1-in. balls. Place 2 in. apart on ungreased baking sheets. Flatten with a fork dipped in sugar. Bake at 350° for 8-10 minutes or until lightly browned. Remove to wire racks to cool.