Cooking with high voltage
This is based on resistive heating of food when current passes through it. Since the resistance of most foods is large, high voltage is needed to get any appreciable power dissipation.
The aparatus is composed of a high voltage transformer removed from a broken microwave and two electrodes which are inserted into the food. The setup can deliver 1.8kW of power.
This technique was sucessfully demonstrated by Walker Chan to win the "what a way to die" category in the 2005 EC Apple Bakeoff.