Line a loaf tin, measuring 28 cm, or the base of a springform, about 23 cm in diameter, with aluminium foil, slightly grease the lining, and dust with flour.
Keep ready! Preheat the oven! Spoon 2/3rd of the dough into the cake tin.
Add 2 tablespoons of chocolate powder and I dessertspoon milk to the remaining 1/3rd of the dough, mix well and spoon over the white dough.
With a fork spiral through the dough bringing the white dough over the chocolate dough, giving it a marble pattern.
Bake in medium hot oven for approx 50-60 minutes, or until fully cooked when tested with a skewer.
Cool for 10 minutes before removing from the baking tin.
To give the cake a shine, make a little sugar syrup by mixing I tablespoon of sugar with 2 tablespoons of water, boil until thick then brush over the cake.
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