In a blender add in the Semolina, Sugar and cocoa powder, Blend it together.
Next add in the Milk, Curd and Oil, Blend everything once again.
Transfer everything to a mixing bowl. Add in the baking powder and mix well.
Cover and set it aside for 30 mins.
Mean while brush a baking pan with oil. Place a parchment paper over it and set it aside.
After 30 mins the batter would have become slightly thick. Add in 2 tbsp of milk and mix well.
Now transfer the batter to the cake pan. Pan it twice so that the air bubbles if any will be removed.
Heat a heavy bottomed pressure cooker or idli cooker. Invert a vessel and keep it inside. Cover Heat it in a high flame for 5 mins.
Open that and then keep the cake pan and cook in a low flame for 40 mins or until the cake is completey cooked.You can check that by inserting a tooth pick of knife ,If it comes out clean the cake it cooked.
Switch off and remove the cake pan from the cooker.Let it cool for some 10 mins.
Run a knife through the pan and relase the cake, If inverted the cake comes out clean.
Let it cool completely and then slice and serve.