Indianapearl
I spoke to some people in India about the solar cooking stoves and they agree it will never happen because the women like to cook on the fire as the chappatis dont get the same crispness from the solor oven, it is similar to cooking with a microwave.

I saw solar cooking stoves in Indonesia many places and the owners all said they were unreliable and took way too long to cook. But they could heat up water in small quantities.

I saw solar reflectors in Lhasa a number of years ago, used to boil water for tea, of course water would boil at a lower temperature in Lhasa.