Marble Cake

Directions

1. 1
   Preheat the oven to 350F.
2. 2
   Grease a ring mold 9 1/2 inches in diameter, with 5 cup capacity.
3. 3
   Put the butter, sugar, flour, baking soda, baking powder, eggs and zest of orange into a processor and blitz to a batter.
4. 4
   Pour the orange juice, with the motor running, down the funnel of the processor to make the cake mixture lighter and smoother.
5. 5
   Divide the batter between two bowls.
6. 6
   Put the cocoa and espresso powder into a small bowl and whisk in the milk; fold this into one of the bowls of cake mixture to make it dark colored.
7. 7
   Spoon a splodge of light-colored cake batter into the pan, and then a chocolate-colored spoonful working around the ring of the mold.
8. 8
   Carry on with a second layer, but dont worry if it is haphazard and not terribly even as this is the whole point of the marbling.
9. 9
   Once you have used up both the batters, give the contents of the ring mold a swirl with a spatula to create the marble effect, and bake in the oven for 35 minutes or until a cake tester comes out clean.
10. 10
    Let it sit on a cooling rack for about 10 minutes before turning out on to the rack to get completely cold.