In a large pot, heat the coconut oil over medium heat. Once hot, add the sliced chicken and cook until no longer pink, about 5 minutes.
Add the grated ginger and minced garlic to the pot, stirring for about 1 minute until fragrant.
Stir in the chopped lemon grass followed by the chicken broth. Bring the mixture to a gentle simmer and let it cook for 10 minutes to infuse the flavors.
Pour in the coconut milk, stirring to combine, and then add the sliced red bell pepper and mushrooms. Let the soup simmer for another 5-7 minutes until the vegetables are tender.
Season the soup with fish sauce and lime juice, stirring to incorporate. Adjust the seasoning according to your preference.
Remove the lemon grass stalk before serving. Ladle the soup into bowls over a scoop of jasmine rice.
Garnish with fresh cilantro and red chili slices for an extra kick.
Notes
Remove the lemon grass stalk before serving for a smoother texture.