Southbank Centre Food Market

You're standing on Belvedere Road with the river stretching out in front of you, and suddenly you've got about fifteen food stalls competing for your attention. This is the Southbank Centre Food Market, and it's properly decent when you want to eat without committing to a full sit-down meal. The setup changes seasonally, so you might find anything from Vietnamese pho to Spanish tapas to proper London pizza slingers depending on when you show up. It's the kind of place where you and your mates can all get different things and actually enjoy them, rather than everyone ordering the same disappointing pasta.