From Traderpedia

Cocoa is an agricultural commodity that is traded internationally. Cocoa futures can be traded on NYBOT in dollars and LIFFE in sterling.

Many different sorts of products can be derived from cocoa. The husks of cocoa pods and the pulp, or sweatings, surrounding the beans and the cocoa bean shells can be used. Some examples of these uses are as fertiliser and animal feeder, but most people will know of the following cocoa products:

Cocoa butter - Cocoa butter is used in the manufacture of chocolate. It is also widely used in cosmetic products such as moisturising creams and soaps.

Cocoa powder - Cocoa powder can be used as an ingredient in almost any foodstuff. For example, it is used in chocolate flavoured drinks, chocolate flavoured desserts such as ice cream and mousse, chocolate spreads and sauces, and cakes and biscuits.

Both LIFFE and NYBOT have websites relating to the trading of cocoa futures.