Casseroles are not allowed to burn on open flames. Due to the problems of manufacturing technology and raw materials, the traditional casserole is not resistant to the change of temperature difference, easy to burst and cannot be dry-burned. Traditional casserole is a ceramic product made of raw materials that are not easy to transfer heat, such as seasonable, feldspar and clay. Fired at high temperature, it has the characteristics of air permeability, adsorption, uniform heat transfer and slow heat dissipation. The recipes that depend on casserole include casserole chicken, casserole tofu, casserole fish head and so on.