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What is a Thermal Cooker?
ThermalCooking.net has the answer:
The term "thermal cooking" simply means "cooking with heat." Thermal cookers are cooking appliances that cook by retaining heat.
Thermal cookers are like a big crock pot, cooking food slowly over time. While slow cookers require constant electricity, thermal cooker utilize heated (boiling) food to complete the cooking process.
What is all the hype about trapping heat to cook your food? Thermal cookers are portable, quick, and convenient. They save energy, are simple to use and easy to clean, can retain both heat and cold, and trap nutrients and flavor inside.
The first step in retained heat cooking is to bring food to a boil. The pot of boiling food is then placed inside an insulater. The food will continue to cook as the temperature of the food slowly drops over time. The result, when done correctly, is food that will maintain safe-serving temperatures for eight hours or longer.
Buy Thermal cooker or assemble them using boxes, coolers, blankets, or pillows and a heavy pot, making thermal cooking accessible to everyone.