not expensive. Chocolate is not expensive at 8 yuan a catty. Chocolate originated from cocoa beans, the fruit of wild cocoa trees in the tropical rain forest of Central America. More than 13 years ago, the Maya Indians in Yoktotan made a drink called chocolate from roasted cocoa beans. Early chocolate was a greasy drink, because the fried cocoa beans contained more than 5% oil, people began to add flour and other starch substances to the drink to reduce its greasy degree.