The steps for making cooked mutton soup are as follows:

1. Prepare all the ingredients.

2. Wash the haggis and put it on a plate.

3. Cut the green onion into sections and slice the ginger.

4. Cut some green onions and mince coriander for later use.

5. Pour an appropriate amount of water into the pot, add the haggis, green onions and ginger slices, and then pour an appropriate amount of cooking wine.

6. Bring to a boil over high heat and skim off the floating residue.

7. Cover the lid, turn to low heat and simmer for at least 30 minutes.

8. Put coriander and chopped green onion into the soup bowl, sprinkle with appropriate amount of refined salt, chicken essence, white pepper and chili oil.

9. Pour the soup into a soup bowl and mix well to complete.