An energy saving stove

One morning a group of gentlemen came to my family, greeted, asked me some questions,. them asked me for the kind of stove i use to prepare my meals. I told them that i don't have a mud- stove but I use coking stones 3 of them. 
After seeing them they told they had an energy saving mud stove which they wanted to make for me if at all i get the materials like mud, water and grass. I got them and made for me an energy saving mud stove which has helped me save almost 50 % of the fuel i was using before.

Location: Kasambya, Mubende, Uganda