(http://www.pbs.org/wnet/need-to-know/files/2010/05/karronculture-badge.gif)This week on our Karr on Culture podcast: A look at "pop-up" restaurants, supper clubs, and other unusual ways of dining out in London The economic slump hit the restaurant business hard: diners cut back, and investors practically stopped putting money into startups. In London, that led to a boom in "pop-up" dining — places where top-notch chefs temporarily took over alternative spaces, from friends' apartments to greasy spoons to construction sites (http://www.bistrotheque.com/news.php?ID=130). This is fine dining's equivalent to the speakeasy — a hot ticket available only to foodies in the know. We travel to Victoria Park (http://en.wikipedia.org/wiki/Victoria_Park,_London) in hip East London, where up-and-coming Scottish chef Isaac McHale (http://www.elliotsboroughmarket.com/) has been running Elliot's in the Park every Friday night in a casual cafe (http://www.the-pavilion-cafe.com/). McHale boosted his reputation by spending a night cooking at (http://theloftproject.co.uk>The Loft Project — a pop-up gone legit — which is)Nuno Mendes (http://www.viajante.co.uk/nuno-mendes.html). He explains the inspiration for his "culinary gallery" in a London loft space. Finally, Niamh Shields, hailed as one of Britain's top food bloggers (http://eatlikeagirl.com/), draws parallels between the clandestine dining movement and the revolutions that have rocked the music industry over the past decade.