Local organization Solar Cookers International make ovens that cook food in the backyard without using gas or electricity! Very efficient financially, but I'm not so sure about how efficient it is with respect to time.
The organization advocates for use of the cookers in areas where gathering scarce wood for cooking fuel represents a time-consuming source of labor. They also advocate cooking with the sun to pasteurize water. Clever!
Link: http://solarcookers.org/
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