This cake is very moist.
1 In a large bowl, cream together the butter or margarine and sugar. Add the eggs, beating well after each addition.
2 In another bowl, sift together the flour and spices. Blend these dry ingredients into the sugar mixture.
3 Dissolve the soda in the sour milk, and add to the batter.
4 Grate the chocolate, and add to the batter.
5 Pour batter into a greased and floured 8 inch round pan. Bake at 350 degrees F (175 degrees C) for 20 minutes, or until done.