Bruise the lemongrass stalk, if you have the long grass strands, tie those in a knot. Set aside.
To make the soup
In a 3+qt pot, heat avocado oil on medium.
Add onions and cook for 2 minutes.
Add Garlic and ginger and cook for another 30 seconds.
Add Anaheim pepper and stir frequently until the pepper is soft.
Add chicken stock, chicken, lemongrass, and salt. Bring to a rolling boil then reduce heat to low for about 40 minutes to draw out the flavor.
Add coconut cream and cook for another 5 minutes.
Taste and add salt if necessary.
Optional
Remove lemongrass and ginger slices prior to serving.
Notes
If you use a carton of coconut cream the volume is less but still is enough cream. You don't need to add two to make 14oz.
Cooking this soup for an extended amount of time will result in a much more robust flavor.
If you're in a rush, you can cook it for less time but the flavor will not be as strong.
In Asia soup is often served with everything in it, the consumer is responsible for setting aside things like lemongrass and ginger. You can either remove them prior to serving or keep things authentic.