From the free “Guide to making edible oils” at http://www.piteba.com/eng/index_eng.htm:
During his career G. Blaak received numerous requests from farmers, development agencies and local authorities how to improve farmers income. Of course the introduction of improved varieties, better agronomic practices and crop protection help only temporarily the individual farmer until his colleagues catch up with him. A more permanent income improvement can be made by transformation of the crop on the farm. In general a big profit (value added) can be realized that is otherwise realized by the large scale processors. Successful examples of on-farm transformation are fermentation of fresh cocoa pods to cocoa beans, sugarcane to brown sugar, fresh tea leaves to green tea, essential oils by steam distillation of freshly harvested aromatic plants, making chocolate from cocoa beans, latex from rubber trees to ribbed smoked sheets and oilseeds to oil and press cake to a protein rich animal feed.