how-the-chocolate-bar-became-a-million-dollar-idea

Nowadays, the world spends close to $100bn a year on chocolate bars, making them one of the most popular snacks in history.

But for centuries, chocolate had only been a drink. No one knew a way of making it into a solid food. That is until a 19th Century Englishman – Joseph Fry – worked out how to do it.

Aaron Heslehurst now explains.

Video producer: Jeremy Howell