Some ideas which came to me after checking the lounge menu:
- Double (or triple) Bacon Cheeseburger. If Boris calls Heathrow a monster, this is the equivalent to it
- Feta (taken from the veg sandwich) instead of cheddar
- Adding chicken slices, cucumbers (instead of pickles) and/or cole slaw to the burger
- A scoop of chili con carne on the burger could be a nice touch as well
The following burgers could be prepared if one part is ordered before noon and the burger shortly afterwards:
- Hamburger with poached egg
- Cheeseburger with mushrooms , grilled tomatoes and hash browns from the breakfast buffet, Terminal Five (Guys) style
Any further ideas? And who will try it first?