i actually planned to buy one for myself, been survey on the price lately...
so, to appreciate this gift, i tried on marble butter cake last weekend.
210g gluten flour/super fine flour
200g caster sugar
1/2 tbsp of baking powder
20g chocolate powder
2 tbsp milk
first beat the butter completely. next, add in caster sugar and keep beating. when its completely blended, put in egg one by one.
next, add in baking powder and low gluten flour and mix them in one direction.
then, take about 1/3 of the mixture and put it in a different bowl, add in chocolate powder. this is to make the topping.
then, spread some butter on the tray. alternatively, you can lay a piece of cake paper on it
pour in the white mixture and spread evenly on the tray
next, pour the chocolate topping on it. use a fork to draw some patterns, this enable the cake to look nicer