So, if you still managed to collect in the forest, then they need to be thoroughly washed and pre-boil for 20 minutes.
If you cook from mushrooms, you do not need to boil them beforehand. I have small mushrooms, I left them whole. Large cut as you like (into quarters or plates).
Fry the mushrooms in ghee over high heat for about 10 minutes. As soon as they start to fry, reduce the heat to medium, add the chopped onion and fry until the onion is transparent.