How To Make Marble Cake

250g butter
230g castor sugar
2 tsp ovalette
4 eggs
60g condensed milk
270g cake flour
1 tsp baking powder
2 tbsp cocoa powder
2 tbsp milk
1 tsp chocolate emulco


Preheat oven to 170°C.
Beat the butter, sugar and ovalette until light and fluffy.
Add in the eggs one by one, beating well after each addition.
Add in the condensed milk, and mix well.
Sift the flour together with the baking powder, and add slowly to the mixture, until it is well incorporated.
Divide the batter into two, leaving one plain, and adding the chocolate emulco, cocoa powder and milk to the other.
Drop alternate spoonfuls of the two batters into a 9-inch square pan, lined with baking paper. Bake at 170°C for 30-35mins.