SOUTH AFRICA. Johannesburg Midrand. Ivory Park. Ecocity. From one of the solar cookers at Ivory Park, Ecocity. The simple bar from which the pot is suspended keeps it upright at all times and the highly polished bowl is turned to face the sun, concentrating the rays and cooking at temperatures reaching between 107¡c and 135¡c (225¡f and 275¡f). 2004.