The Cacao bean is native to South America, but it became the cocoa we are familiar with when the Dutch van Houten found a new processing method, and it was  British George Cadbury in 1878 who created a model garden city of Bourneville for his chocolate workers. On this cold and snowy day I have been reading a beautiful and fascinating book, Fifty Plants that Changed the Course of History by Bill Laws. Cocoa is popular drink around our house in…