Columbus took cacao back to Spain with him, but it didn't catch on until Cortez introduced it in the 1500s. For a long time it was considered a food for the rich. Bananas are a great energy source. Bananas ripen after harvest. As they turn yellow, starch is changed into sugar.
Black spots indicate more sugar.
Keep them in a cool place to slow ripening. A chocolate bar contains about the same amount of caffeine as a third of a cup of coffee. Each kind of chocolate has its own chemistry and reacts differently when cooked. All chocolate begins with roasting cocoa beans. This is either dried or used as an ingredient in making a type of chocolate.