Victorian cooks hated to waste food, and had all sorts of creative ways to use up leftovers. This super simple one-sentence recipe is an excellent way to use up leftover sponge cake (or, in my case, to use up a failed pound cake that didn’t rise properly. It’s not a failure if you can turn it into something else!). It works on the same principle as a custard-based bread pudding, just using cake instead of bread.