In a large bowl, combine flour, sugar, baking soda and salt.  Cut
      in shortening and peanut butter until mixture resembles coarse
      crumbs.  Stir in the corn syrup and milk; mix well.  Shape into
      a 2-inch roll and wrap in waxed paper or foil.  Refrigerate for at
      least 3 hours.  Cut into 1/4-inch slices; place half of them 2 inches
      apart on an ungreased baking sheet.  Top each with 1/2 teaspoon of
      peanut butter.  Cover with remaining slices.  Seal edges with a
      fork.  Bake at 350 degrees for 12-14 minutes or until lightly
      browned.  Cool for 2 minutes, then remove from pans to wire racks to
      cool completely.  
      Yield: about 2 dozen cookies.