Chieftains o' the pudding-race!

Waitrose, Canary Wharf
I went haggis-hunting this evening (the space on the shelf is where mine was) and found the 'chieftain' of Burns' address for our Friday night noshery.
I celebrate Burns' night out of tradition - the tradition is not because I'm Scottish (there's a bit of Macintosh somewhere in the genes but safely overwhelmed by the welshness of the rest) but stems back to a meal i cooked for a homesick friend I had many years ago.
As things turned out back then they were unable to make the meal due to a dodgy sandwich but the rest of us (all not scots) went ahead and so the tradition of hosting a scot-free Burns' night was born.
I've yet to have a genuine scot attend one (the few we know go back home) and so the pronunciation of the address is pretty comical. I prefer to channel my inner Proclaimers but Sean Connery works equally well.
Now, what dessert can I make out of irn bru?