Photograph: Louise Hagger/The Guardian. Food styling: Emily Kydd. Prop styling: Jennifer Kay. Food Styling Assistant: Kristine Jakobsson.ould chocolate cake be one of the world’s most welcome guests? A prolific traveller across the globe, and an integral part of office meetings, fundraisers, dinner parties, batmitzvahs and no doubt weddings, too, the chocolate cake plays an outsized role in helping people celebrate.
In another large bowl, break the banana into chunks, then mash with a fork as well as you can, so it’s as smooth as possible. Add the oil, vanilla paste and oat milk/vinegar mixture, then beat with an electric mixer on a medium speed until combined. Turn up the speed to high and beat again until the banana has completely broken down and everything is well combined.
Meanwhile, make the buttercream. Break the chocolate into small pieces and put them in a single layer in a glass or microwave-safe bowl. Heat in 30-second bursts until nearly melted , then put to one side.