The HI double-walled pot is perfect if you want to use the bain-marie method to prepare a special recipe or to heat up some food. To use this double pot, fill the bottom pot with one or two inches of water. Then add your desired composition to the top pan and turn on your stovetop. As the water heats and steam is released, the steam is trapped between the two pans. This then heats the food in the top pan. The HI bain-marie pot is made of stainless steel and has a whistling kettle function. It's perfect for melting the chocolate you want to add to a birthday cake!