Preparing food is the fourth ... enable the shortening of cooking times, and for those who like dishes that take hours to simmer, vacuum-insulated pans can be a real energy-saver.

If your pan has no lid, the process will require more energy, as water will dissipate into the air – remember, you can use that steam to cook other foods, such as soft veg and fish, if you have ...

Geothermal energy is a renewable resource ... of 100 to 110 degrees Celsius, cooking generally takes no more than five to 10 minutes, “so the food retains its original colour”, Tanaka explains.