Banana & Cardamom Chocolate Brownie Cake

Chocolate is so versatile that many flavours can be paired with it, transforming the flavour of this brownie cake – blackberries, raspberries, peaches… the list goes on!  Here I’ve gone with banana and cardamom; it’s always handy to have a recipe to use up the ripening bananas in the fruit bowl that everyone promised they’d eat three days ago!