But best of all, those with a sweet tooth could try the one-woman opera Bon Appétit! by Lee Hoiby: adapted from a classic Julia Child cookery broadcast, it requires the singer to bake a chocolate gateau on stage. When the mezzo-soprano Emma Curtis performed it at the Bloomsbury Festival recently, her audience could first enjoy the smell of the baking cake, then eat it at the end. It was even gluten-free.

— Read more about scented operas (past, present and future) at Pagliacci and Cavalleria rusticana: Smelled any good operas lately? at the Independent.