In a mixing bowl add the curd and sugar. Whisk it nicely till the sugar is dissolved completely.
Add baking soda and semolina, mix well and keep aside for about 10 mins.
Seive the flour, cocoa powder and baking powder and mix well.
Add oil, vanilla essence and milk to the curd mixture and mix well.
Heat water in idli steamer. Grease the idli plate with oil and set aside. Add the flour mixture to the curd mixture and fold gently to make a smooth batter.
Now spoon this into the greased idli plate and steam for 10 mins on medium heat. A toothpick inserted should come out clean.
Meanwhile melt the chocolate and sugar. Add cocoa powder, milk, mix and stir well and make a smooth sauce.
Remove the cake plate from the steamer and let it cool down for few mins.
Take out the cake from the plate slowly. Serve chocolate sauce and sprinkles or can just serve at it is.
