Marble cake

Whenever someone sends us food in a big box we return the box with something in it. So this time for one of our closest family friends we returned the box with a marble cake.They were curious as to how i got the pattern and that mild taste of chocolate in the cake.Well this is how:

What i used:
ingredients of a pound cake
1/2 cup cocoa powder
4 tablespoons sugar powder

How i did it:
1. Make the batter of a pound cake
2. Split the batter in two separate bowls
3. In one bowl with batter mix the cocoa powder and sugar and stir continuously.
4. Pour one spoon of the chocolate batter and then one spoon of the plain cake batter until the cake tin fills up till an inch less.
5. Gently draw streaks on the batter with a toothpick for the marble effect
6. Bake in a preheated oven for 30-40 minutes or until when a toothpick inserted comes out clean.