Ha! There you go again with your secret sauce. This is classic mysterious Iain. It's wonderful. It's beautiful. It's made of whaaaa? And we all want to touch it, but you won't let us. You are so mean, but we love you for it.
Thanks Arty! Reminds me of the "secret" ingredient "handed down the generations" I used to kid my daughter about, when serving my speciality dish, baked beans on toast.