Mushrooms are dark when cooked in soup. They are probably not washed or used by you, that is, dried red mushrooms, which turn black when cooked. Mainly related to ingredients, of course, also related to utensils, such as iron pots.

Hei Hu Mushroom Stewed Pig Bone Hei Hu Auricularia auricula was grayish brown, shaped like Tiger Claw, hence the name. Auricularia auricula is only produced in parts of southwest China and is very precious. For a long time, it has been regarded as a rare mountain treasure in history and one of the favorite tributes of the imperial court.