Exploring the historical connection between slave-grown sugar and chocolate, and the evolution of the chocolate bar

It's one of the world's most popular treats and a significant part of the global economy, but how much do you really know about the history of chocolate? Well, for today's 'everything you wanted to know' episode, Rob Attar was joined by the food historian and author Emma Kay to explore the long journey from the first cultivation of cacao to the chocolate bars we enjoy today.

The HistoryExtra podcast is produced by the team behind BBC History Magazine.

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