Cut carrots and potato into normal sized pieces.
Cut red chilies into small pieces.
Take a pot and put chicken and water into it.
Then heat it until chicken is boiled well.
Place aside the chicken boiled water.
Next, take a pot and put oil into it.
After heating oil, add Onion and fry on medium heat until golden color.
Then add ginger and garlic to it and fry them.
Next, add chicken boiled water, Fish sauce, Peppercorns and lime leaves to onion mixture.
Then, close the lid and cook until boiling.
Now, cook it again on low heat, about 15 minutes not closing the lid.
After that, filter this soup liquid.
Add boiled chicken, carrots, potato, noodles and mushroom to the soup liquid and cook well.
Next, add salt and mix well.
Now, you can be served it. You can add lime juice according to your taste and mix well. Also, you can sprinkle the chopped coriandar, onion leaves and red chilies on it.