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Solar Cooker consists of a box of insulated material. Its inner walls and bottom are painted black. It has a glass cover at the top. When the solar radiations falls on the solar cooker the black surface absorb the solar energy and the chamber is greatly heated. 
This immense heat of the solar cooker can then be used to cook rice,dal and vegetables.
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Basically, a solar oven or cooker is made out of a box with aluminium foil and painted black. Aluminium foil and the color black absorbs heat from the sun's rays and also warms the food. So that's how it works. 
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