You can now change any pot into a slow cooker, double boiler or rice cooker thanks to the Simmer Mat's unique design. It acts as a heat diffuser or heat transfer plate to help control the temperature of your cooking surface. It is distributing the heat around the bottom of the pot evenly and so is ideal for long, slow cooking. Just place the Simmer Mat on your cooktop and place your cooking pot directly on top for perfect heat control. It is suitable for using on most cooking surfaces for perfect simmering every time.