The importance of reading what you've written

Many of you know what I do for a living, and also know that I get irritated when I see mistakes in printed material, on telly or wherever they may occur. Just occasionally, though, you see one which fills you with joy. This has, I promise, not been retouched - it's a photocopy of the front of a real menu, which I've scanned. I've annotated one mistake which is pretty obvious, but there's another on there that they really, really should have watched out for. See if you can see it.

Let's just say that I'd insist upon this fabulous offer, were I ever to visit this no doubt fine establishment.