Now .... as you recall, for our Geo Quiz --- we asked you to name a London neighborhood.

The answer is Shoreditch.

Shoreditch is home to the Marksman Pub -- which has lately been experimenting with barter.

Barter table: photo Alex Collins

Most nights, you can find San Francisco native Dawn Koplin tending bar there. In between pouring pints --- she explains how the bartering works:

Our "Barter for Beer Night" postcard came to us courtesy of producer Alex Collins.

You can sometimes find him at the pub in Shoreditch, the answer to our Geo Quiz.