Ingredients

25g cocoa powder, sifted

280g peeled, mashed bananas

2 eggs, beaten

1/2 teaspoon vanilla extract

225g self raising flour

110g butter

110g light brown sugar

Method

Line a 900g loaf tin with baking paper. Dissolve the cocoa powder in 4 tablespoons of boiling water and set aside to cool. Preheat oven to 180C/160C fan.                                      In a small bowl, mix the bananas, eggs and vanilla. Sift the flour into a separate bowl and rub in the butter with your fingers. Stir in the sugar and the banana mixture. Put a third of the mixture in a small bowl and stir in the cocoa mixture.                                                  Put random dollops of each cake mixture in the tin until you’ve used it all, then swirl with a knife to create a marble effect.                                                                                         Bake for 50-60 minutes or until golden and a skewer inserted into the centre of the cake comes out clean. Leave for 10 minutes, then turn out onto a wire rack to cool.