Given the lightness and beauty of the finished product it was actually almost embarassingly easy to put together. I used orange extract rather than lemon and way less than in the recipe. It reads as a tablespoon in the recipe. I don't know if that's right but I used just a teaspoon. The recipe is really huge by the way. You'd maybe want to divide it if you're going to make it yourself.

It's impossible really to imagine just how light this is. As you bite it or slice it it make a little bubbling, popping noise like a marshmallow as the tiny delicate bubbles burst. It's delicate, with just the right amount of sweetness and a beautiful hint of orange. This is the almost the opposite of the caramel cake of a few weeks ago. Where that beats you in the face with sugar, this wins you over with a great, subtle flavour. I loved it and the colleagues were pleased with the choice. One said he could happily sit down and eat a whole cake. I think he probably could too.