UK: Tuna sandwich, leek and potato soup, Maltesers.
According to Viking's research into British eating habits, the most common office lunch in the UK is a no-frills tuna sandwich with microwaved leek and potato soup, followed by Maltesers and a coffee.
or "Shepherds pie" (lamb stew with potatoes covering the top. Keeps warm till after noon)
Oh and "Cornish pasty" like the shepherds pie but all encased in pastry.
I typically did one of these most lunchtimes when I started working when I lived there , all washed down with a pint or 2 of course