If you find that happening, there's an easy way to boost the flavor without throwing off your recipe ratios — add a dash of banana simple syrup. This type of syrup has a sweet, tropical flavor ...

Shake out any excess flour. Blend the bananas in a food processor until roughly chopped, then add 75ml/2¾fl oz of the maple syrup and blend to a smooth paste. Pour in up to 50ml/2fl oz of milk ...

Add the golden syrup and eggs, one by one, beating continuously. Remove the bowl from the mixer and fold in the mashed banana. Sift the flour and gently combine mwith the batter. Add the walnuts.