A cake that is mostly made in a saucepan goes slightly against the grain, but makes it all pretty easy. You don’t need an electric mixer for the egg white whipping bit, a firm arm with a hand whisk will do the job quite nicely.
I found it took a lot longer to bake than the 40 minutes suggested, and I gave it 55 in the end, but it might have needed a bit more. My eggs were from a mixed box, not the medium ones stated, so maybe that affected the cooking time.
It does shrink down quite a bit after baking and I didn’t use the cream topping suggested. Here’s some pics, and it was rather tasty.