Putting ketchup on a hot dog: In Chicago, it can get you shunned by strangers or disowned by family. But why? And will a gutsy new viral campaign from Heinz -- with interactive displays giving out free ketchup in front of longtime sausage strongholds like the Wiener's Circle -- sway anyone who's still on the fence? This week, host and producer Jim Hanke welcomes food writer David Hammond to discuss the history of the Chicago hot dog, and why ketchup has become such a divisive condiment along the way. 

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