1 yellow cake mix
1 sm. box instant pistachio pudding
3/4 c. oil
4 eggs
1 c. sour cream
8 oz. Hershey's syrup

Mix cake mix, pudding, oil, eggs and sour cream. Pour 2/3 of the batter into a greased and floured bundt pan. Add chocolate syrup to the remaining batter. Form a canal in the batter and pour the chocolate batter into the canal (this will make a chocolate tunnel through the cake). Bake at 350 degrees for 60 minutes on the center rack. Cool before removing from pan. Dust with confectioners sugar or chocolate glaze.