Baked pears with rock sugar do not need stainless steel cups, but use teapots. Purple sand has slow heat transfer, it is not easy to get hot hands when used, and it is resistant to boiling, so it can be stewed on a warm fire, so the casserole made of purple sand is very popular with people. In addition, purple sand is a rare feature of baked pears because of its slow heat transfer and longer heat preservation. The teapot used to bake pears is heated on the fire (or some induction cookers), but it must not be heated by microwave oven. If you use a stainless steel cup, it will change color with fire, and it is not easy to clean. It is also harmful to the human body to hold Chinese medicine and stew. At present, stainless steel materials on the market are mostly stainless steel iron. It is best to stew pears to relieve cough, and you can also put some tremella, which can relieve cough and resolve phlegm, nourish yin and moisten lungs, and is healthy and delicious.