This incredibly soft, tender, and fluffy buttermilk coffee cake is baked up with a swirl of cinnamon and sugar and a chewy, nutty streusel crust. The cake is an irresistible combination of textures - ...
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 ...