This paper looks in some detail at the production of juice, jam, jelly and muffins from Marula, Monkey Orange and Embee.
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The results are good and show a high degree of acceptance for the products made.
However, having just been looking at some of the attempts to commercialize this type of food in South Africa, it is the commercialisation which is the difficult step. Giving recipes and training to communities is unlikely to create jobs unless a focused entrepreneur gets hold of it.