Preheat oven to 350 degrees. Butter and flour two loaf pans.
For pound cake, soften butter and shortening. Gradually add sugar, beating for 1 minute. Add eggs, 1 at a time, beating for 1 1/2 minutes after each addition.
Sift together flour, salt, allspice, nutmeg, baking powder, cloves and cinnamon. Blend together cider and vanilla. Add dry ingredients to butter mixture alternately with cider mixture. Stir until well-blended. Pour batter into prepared pans. Bake for 50-60, or until done. Cool cakes in pans for ten minutes, then remove from pans and cool on wire rack.
For glaze, stir together sugar, buttermilk, baking soda, corn syrup, butter, vanilla and cinnamon in medium saucepan. Bring to a rolling boil over medium-low heat. Boil for 6-8 minutes, stirring occasionally, or until candy thermometer registers 185 degrees.
Place a piece of waxed paper underneath the cooling rack that your cakes are on. Pour glaze on top of pound cakes and using a frosting spatula, gently spread glaze out to the sides and allow it to drip down.
Cake will keep in a covered container or cake plate for 2-3 days.