I actually paid for a business class ticket the other week, so I thought I'd take the opportunity to order a VLML rather than take whatever the miscellaneous veggie option was. This proved to be an excellent idea, as my VLML box contained not only the Toffee Crisp on offer to the rest of the cabin, but an Aero as well! The person across the aisle looked on longingly, and asked if he could trade his box in for an Aero-containing one, but was told "sorry sir, that's just in the vegetarian meal"

Combined with the mid-haul seats, it made the slight extra cost surprisingly worthwhile!
Slightly more on topic, I too spotted the mystical "invitation" on my tray, and dived straight in. After struggling valiantly to defeat the industrial-strength glue holding it shut, I was most disappointed to find my efforts were all for nothing. Bah.