If you don't have a casserole, you'd better use stainless steel pot, because stainless steel pot has fast heat transfer, so you should pay attention to stirring frequently when decocting the medicine, otherwise the medicine will stick to the pot wall and be easy to fry. What needs to be reminded is, don't use aluminum pot or iron pan to decoct the medicine, which will easily react with the ingredients in traditional Chinese medicine, thus reducing the efficacy, and may even lead to consumer poisoning. This is because aluminum and iron are active elements, and each traditional Chinese medicine contains dozens or even hundreds of compounds, and many chemical reactions may occur after aluminum and iron are combined.