Take sugar, oil, milk, vanilla, egg in a bowl and mix well.
Take flour, cocoa, baking soda, baking powder in a bowl and mix well.
Pour the wet ingredients into the dry and give a good mix.
Pour this into the prepared pan cover it lightly with a oiled foil, the oil side should be down .
Place it in a steamer and Steam this for 40 to 45 mins, insert a toothpick to see whether it is done or not. If it comes clean then it is done. Let it cool for 15 to 30 mins.
Now run a knife around the sides, invert it to a cake plate.
Peel off the parchment. Pour the icing over it and sprinkle with chocolate semia.