The population of Solar Cookers International is 5.
The three different types of solar cookers are box, panel,and parabolic.
Solar cookers stop working at night, and work less well if the sky is heavily overcast.
A parabolic is an improved box cooker.
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The intensity of heat (fire) needed for frying or making chapatis is not available in solar cookers.
South Africa is a relatively large country with a substantial rural population, so the potential for relatively simple and inexpensive solar cookers is high, but be warned you will need a method to market and distribute the solar cookers to the rural areas.
There are a number of retailers which offer solar cookers. You can try visiting websites such as India Mart and Sun Oven to see some examples of what is on offer.
in your backyard
The idea is to concentrate the solar radiation.
it can observe the heat and reflect the light from the solar cooker