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Antonio Durbe, left, and Daniele Tummei collect freshly toasted coffee grains from the Purosole, Pure Sun, solar light coffee roaster, in Rome. The electrical engineers invented a plant that just needs a piece of land about the size of half a tennis court and sunny weather to toast up to 50kg of coffee an hour. No gas, no electricity, just sun rays concentrated by a set of mirrors on a rotating steel basket filled of fresh coffee grains. (AP Photo/Andrew Medichini)
The engineers overlook the functioning of the Purosole, Pure Sun, solar light coffee roaster, (AP Photo/Andrew Medichini)
A steel basket containing fresh coffee grains rotates while toasting them in Purosole. Pure Sun, solar light coffee roaster, (AP Photo/Andrew Medichini)
Daniele Tummei checks the functioning of the Purosole, Pure Sun, solar light coffee roaster, (AP Photo/Andrew Medichini)
Sun is reflected in the mirrors of the Purosole, Pure Sun, solar light coffee roaster. (AP Photo/Andrew Medichini)
