Here is a nice story that shows how easy it is to establish an operating fruit and vegetable drying business.
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Menar Meebed of Egypt, has used a commercially available solar dryer and a simple Internet blog to set up a business selling dried fruit and vegetables. Her product is of a higher quality than the traditional products because of the fruit she selects and the fact that the solar dryer reduces the drying time.
The commercial success of the business of course depends on how well she sources her produce, whether the market demand for her product is big enough and how she manages the business but the basis is in place.
This is one more of those amazing sources of information that the INTERNET provides for free. In the past if you were lucky enough to know about it you could probably request a copy. Now you GOOGLE and FTP a PDF for free!
The manual is comprehensive, starting with some of the principles of preservation, moving into the different processes that are applicable (both from a process and a product viewpoint), covering hygiene and nutritional aspects and ending on recipes to be used with these processes.
This is a book you should put in your Technology Directory/Folder for the time you need some good technical information on fruit processing, whether it be for indigenous or other fruit.