There’s something very charmingly old-fashioned about this cake. It’s soft and velvety in its crumb, but really, it’s all about that fantastically good icing. Make a big round cake as I have here, or cook the batter in a roasting tin and then ice and slice the cake into squares for a school cake stand or similar
Grease and line a 24 cm (9½ inch) round cake tin with baking paper.
Beat the butter and sugars in an electric mixer fitted with the paddle attachment for about 5 minutes or until pale and fluffy.
Scrape down the side of the bowl, add one of the eggs and beat well, then add the other egg and beat again.
Sift the flour, baking powder and cinnamon into the bowl.
Add the banana, buttermilk or yoghurt and vanilla and fold until just combined.
Transfer the batter to the tin and smooth the top.
Bake for about 40 minutes or until a skewer inserted in the middle comes out clean, the edge is coming away from the side of the tin and the top of the cake feels springy.
Leave the cake to cool in the tin for 5 minutes, then gently turn it out onto a wire rack to cool completely.
For the icing, combine the brown sugar, butter, milk and coffee in a small saucepan over medium heat.
Bring to the boil, then reduce the heat and cook, stirring, for a couple of minutes.
Remove the pan from the heat and whisk in the icing sugar until smooth.
Pour the icing over the cooled cake and quickly smooth the surface (it sets pretty quickly, so don’t mess around).
Notes / Tips / Wine Advice:
You can leave out the coffee in the icing, if you prefer.