3/6. What's the secret of a successful souffle? Paul Merrett explores the culinary science of eggs. Plus an authentic Spanish omelette, the history of the lion quality mark and the truth behind salmonella scares. Series producer Gillian Scothern ; Exec producer Clare Sillery RECIPE CARDS: available free of charge from [number removed] (calls charged at the national rate) or by logging on to www.open2.net