South Africa, May 13 -- Inspired by a method her grandmother used in the 1970s to help save power when cooking, and similar to the concept of a haybox - which was used to keep food warm and preserve fuel during World War Two, Collins first tested her idea by surrounding a pan of hot food with cushions after she had turned off the stove.

The brainwave was a success, and to her amazement the food had continued to cook for several hours.

Since then, the traditional concept stayed with her, and she saw the potential to address so many of today's challenges - from energy poverty to climate change.

"I wanted to create something that could empower people, especially women, by giving them a way to cook efficiently, safely, and sustainably, eve...