Who cooks in developed countries uses the better known tips for energy-saving cooking pour as only the necessary amount of water, cover it, and high parboil 'downshifting time and cook. Another very energy efficient cooking means is the pressure cooker, parboil, downshifting on very small amount of energy can cook, it is hardly economical, stews, Gulsch, roulades etc. succeed here with minimal energy use.
For this, the fry or even just a fried egg comes in 'Wonderbag' do not go. Our eating habits are likely with the 'Wonderbag' simply not be compatible.
It will therefore probably a few users strike from the eco-scene and simmer stew in her, otherwise the issue will be settled here with us shortly. And for the price is quite lush.