Preheat oven to 350 degrees.

Grease bundt pan.

Follow cake mix directions except replace water with buttermilk, and add 4 eggs instead of the number called for.

Follow baking directions, check approx 5 minutes before timer goes off.

Allow to cool in pan 10 minutes, then cool on wire rack approx 1 hour or until throughly cooled.

Prepare Icing

Melt 1 stick of butter on low/medium heat on stove.

Add cocoa, confectioners sugar and milk stirring until combined.

As confectioners sugar melts whip icing with a whisk to smooth icing.

Bring to a boil, then remove from heat. Add vanilla and stir.

Watch consistency of icing as it cools.

When it starts to thicken up a bit scoop out icing with a 1/2 cup measuring cup and drizzle on top of cake allowing it to drip down the sides and middle.

Allow to completely cool.

Shave chocolate bar with cheese grater, sprinkle generously on top of cake. I used 2/3 of an Aldi's premium milk chocolate giant candy bar.

Serve and enjoy!