What is a double-layer kettle used for? How to choose one?

A double-layer pot is a versatile piece of equipment widely used in the food industry for various cooking applications. It is commonly employed for tasks such as stir-frying, making porridge, soup, and rice, dissolving sugar, melting oil, boiling noodles, and preparing fillings like bean curd paste, lotus seed paste, and mooncake fillings. Additionally, it is used for cooking bamboo shoots, duck products, chicken, chicken wings, duck eggs, duck feet, duck necks, pig ears, and other ingredients. Double-layer pots are also suitable for making soy sauce and handling both liquid and solid materials, depending on their design and structure.