Mix sugar, cocoa powder and water. Boil the mixture and make it thick. Stir continuously. Remove from fire and allow to cool.
Beat the yolk of an egg and vanilla essence. Mix butter and powdered sugar. Add the beaten egg and the remaining eggs to it and soften the batter by stirring. Add the prepared cocoa mixture to this.
Mix baking powder and refined flour. Add soda powder to the curd.
Mix the flour and the curd to the early prepared mixture. Stir it well. Pour it to a greased vessel and bake for 45 minutes.
