From a Gizmag article we found that entrepreneurs David Toledo and Paul Slusser have developed a line of thermoelectric cooking pots for camping.
The cooking pots called PowerPot come in two sizes. Both of them incorporate a fireproof base made from thermoelectric material. When filled with liquids and placed over the flame of campfire or gas stove, the temperature difference between the top and bottom of that base creates a current. The current is carried by an attached flame resistant USB cable, with an integrated waterproof power regulator, which is used to charge or run the user’s device.
The smaller model, the 5-watt PowerPot suitable for backpackers, is made from hard-anodized aluminium with folding rubberized handles and weights about 12 ounces (340g).
The larger 10-watt PowerPot X holds two quarts (1.9 L) of liquid, and is designed more as a kitchen-style cooking pot, for use on gas ranges and could charge tablets. Also in the works is the 15-watt one-gallon (3.8 L) PowerPot XV and could perhaps even power the lighting system of a small home.
All of the models of cooking pots have sealed electronics, no moving parts, and are said to produce enough electricity to powers at least two small devices (such as smartphones, mp3 players or LED lights) at once. A full charge should be possible in about 60 to 90 minutes.