This banana and raspberry walnut loaf cake gets a big thumbs up from friends and family. I have made lots of versions of banana cake over the years, and love mixing with different ingredients like sultanas, or walnuts or other fruit. This time I made a banana and raspberry walnut loaf cake, and used brown soft sugar instead of demerara sugar which is why it is darker in colour. I love making loaf cakes as they are easy to carry when visiting friends.