"A layer of salted caramel and white chocolate on all butter shortbread finished with milk chocolate and gold lustre."
The food gods must have also agreed that I definitely needed to try it too, for when I got to Waitrose all the Christmas Millionaires Shortbread were donning reduced yellow stickers, despite having a best before date of the 22nd of December. I paid £1.05 for the slice, but I can't remember how much the full price was, sorry.
I ignored the instructions to keep it in a cool dry place, and popped the shortbread in the fridge to chill before opening. Later on I found that the knife easily and cleanly sliced through it, though I'm not sure I would've found the same if the caramel was at ambient temperature. The layers were each respectably ample; the thickest of which was -of course- the biscuit base.
Of course, the caramel has to be the star of any Millionaire's shortbread. Waitrose have been braver with this, producing a layer that was both sticky, smooth and definitely salted. Luckily they've got the salinity just right, any more and I'd have thought that Heston had stuck his oar in, but it was absolutely scrummy.
Millionaire's shortbread might not be the most traditional of Christmas snacks -but it's certainly worth buying one (or more) of these before they disappear come January.