Chilled Herbed Pea Soup

Martin Berasategui, the Basque superchef of the eponymous restaurant near San Sebastián, heads an incredibly successful restaurant group that includes the avant-garde restaurant at the Guggenheim in Bilbao, as well as the even more avant-garde Mugaritz, headed by chef Andoni Luis Adúriz. Berasategui is coauthor of a lovely cookbook called El Mercado en el Plato—the market on your plate. While the food at his restaurants is too complicated for regular home cooks, the book is filled wi