Episode 4: Matthew and James have to find Portugal's link to Scandinavia and head to Aveiro, where they cook salt cod. In New York, Matthew Rhys and Joe Fattorini enjoy an Irish stew at Molly's Shibeen on the Lower East Side of Manhattan. Amelia Singer joins Joe to find out who really invented Champagne. Dominic West and James sip wines in the Douro Valley.