I've seen many people on this board writing about cooking. It is a quite good practice to cook sometimes something. At least if you don't eat sometimes something you will most probably die.
In 2008 I was working about three months near Hanoi, Vietnam. There in rural areas ground water qualities are so bad that people are told to boil all the water before using it. They are facing other problems of cooking energy, too. Many of the local small-scale farmers are using rice-husks and other waste products of their fields for cooking.
With the support of a Finnish NGO we started there a solar cooking energy project. In the above picture I'm putting together a solar cooking machine with a local lady, one of the users of the technology. The machine is made by my good friend in India, the leader of the company called 'Tinytech Plants'.
We bought five pieces of these cookers from India and twenty pieces of Chinese made solar cookers. In the second picture my friends in the village are checking the cooking process of a Chinese made solar cooker as produced by a company called 'Yancheng Sangli Solar Energy Co. Ltd'
There are more than 600 000 Solar Cookers like this in use in the north part of China and in Tibet.
If the sunshine conditions are good the machine can cook with roughly same speeds as electric cooking plates.
Our plan is to use first factory made solar cookers for trial purposes in the villages. If the trial period will show that they are practical enough in this area we will start producing them locally.
It is not difficult to make solar cookers, some of my instructions how to design and make them are published here:
People in Vietnam are working hard and they are clever utilizing their available machineries. Below a picture of transporting goods in Vietnam.