Take one cup maida, one cup corn flour, one cup unsalted butter, one-fourth teaspoon baking powder and baking soda, and two cups buttermilk.

Allow to cool until lukewarm. Add the butter and beat with an electric whisk for 5 minutes. Beat in the icing sugar and then the buttermilk. Place in a piping bag and pipe onto cake.

Line a 10 inch cake tin with parchment paper. Place the sugar, chocolate, butter and water in a saucepan and cook gently until the chocolate and butter have melted. Cool Whisk in the buttermilk ...