Combine all ingredients for batter, mixing well. Pour three fourths of batter into 10-inch bundt pan.
Add melted chocolate to remaining fourth of batter. Pour over batter in pan, swirl with form to marbleize.
Bake at 350 degrees Fahrenheit for one hour. Sprinkle with confectioners sugar.
Melt all ingredients for glaze over double boiler, stir until dissolved. Immediately, pour glaze over cake, allow to drizzle onto sides.
Photography by Peri Photography