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'Urban foraging' is the practice of harvesting food that grows naturally in the city where you live. Once a fringe activity, urban foraging is gaining acceptance in some US cities as a measure to protect against increasing food insecurity. We’ll go harvesting with some foragers in Seattle. We’ll also hear how coffee powers America’s soldiers… and why it’s okay to leave one Japanese restaurant in New York City without tipping. We’ll also sample some New Orleans gumbo. It’s the dish that defines the city, or is it the city that defines the dish?

Picture: Melany Vorass Herrera harvests stinging nettles from Seattle’s Golden Gardens Park. It’s technically illegal, but like many other US cities, Seattle is starting to promote careful urban foraging.