What are the three immortals in Chinese medicine?

Each of the three immortals in Chinese medicine refers to burnt hawthorn, burnt shen qu and burnt malt, and is recommended to be used in accordance with medical advice.
Burnt hawthorn is made by taking the Chinese medicine hawthorn, putting it in a preheated frying equipment, and frying it over medium heat until the surface of hawthorn is burnt brown and the inner part is yellowish brown, then it can be taken out, let it cool down, and remove the crumbs. It has the effect of eliminating food stagnation (promoting food digestion) and is used for dysentery and stagnation of meat and food. It should be used with caution for those with spleen deficiency and no stagnation.
Jiao Shenqu is made by taking Chinese medicine Shenqu, putting it into a hot pan and stir-frying it over a high flame until it turns burnt brown, then take it out and let it cool. It has the effect of eliminating food and stopping diarrhea, and is used for food stagnation, epigastric (abdominal) distention and fullness, vomiting and diarrhea, and loss of appetite.
Jiao Malt is made by taking Chinese malt, putting it into a hot pot, stir-frying it over moderate heat until it is burnt brown, and then taking it out and letting it cool. It has the effect of eliminating food and resolving stagnation, and is used for food stagnation (the accumulation of food in the stomach due to indigestion) that does not go away, and distension and pain in the stomach and abdomen. It should not be used by lactating women.
When using Jiao Shanzha, Jiao Shenqu and Jiao Maimao to treat diseases, it is recommended to use them under the guidance of a professional physician to identify the symptoms, and not blindly self-medication.