This St Patricks Day you can have your beer and eat it! This cake is magnificent in its damp blackness. I can’t say that you can absolutely taste the stout in it, but there is certainly a resonant, ferrous tang which I happen to love. The best way of describing it is to say that it’s like gingerbread without the spices. There is enough sugar – a certain understatement here – to counter any potential bitterness of the Guinness. This cake is also so popular that students of pastry schools often bake it.