Place the ingredients in the oven in the morning, enjoy your day, and return to a hot meal ready to serve. For days when the sun doesn't shine, you can always go back to your regular stove and use some of the electricity or gas you have saved. The world can choose sunlight or further deforestation, solar cooking or widespread starvation. Or you can build your own in an evening or two. In third world countries in Africa and Asia where fire wood and other cooking fuel has become too expensive or is increasingly unavailable, a solar oven made out of whatever materials are at hand is a marvelously simple and efficient alternative to traditional methods of cooking.
Water is also easily boiled and sterilized, thus reducing illness and in fact saving many lives.
Consider becoming a member and supporting their wonderful work. Some units have huge polished aluminum reflectors and many other sophisticated features. They can develop temperatures of 175-400 degrees depending on conditions and how directly you position the oven toward the sun. West 835 Midan Drive Elburn, IL 60119 . There are now a number of different solar oven kits available.