The home of Mozart, The Sound of Music and Arnold Schwarzenegger provides the fifth leg of the Hairy Bikers' adventure. The trip starts in Vienna, patisserie capital of the world, and ends atop the spectacularGrossglockner Alpine pass, one of the world's most spectacular biking roads.In Vienna, Si and Dave unravel the mystery of the two competing sachertorte recipes and taste the latest version - sachertorte 'reloaded'. They make apfelstrudel with the owner of a roadside B&B, cook linzertorte in Linz and a chocolate gugelhupf cake for a bunch of bikers from Huddersfield.Along the way, they also meet a former baking world champion to see how he has reinvented gingerbread, and discover the 'green gold' of Austria - nutritious, delicious pumpkin seed oil. In this largely Catholic country, the Bikers overnight in a monastery and are up with the lark to cook kipferl, a giant 'brioche meets croissant', for the monks' breakfast.And, of course, you can't travel through Austria without learning to yodel. That is where Fritz comes in, mountain man, wood-fire cook and yodel coach - a real one-off.