In a large pot or Dutch oven, heat the sesame oil over medium heat. Add the garlic, ginger, and lemongrass. Sauté for about 1–2 minutes until fragrant.
Cook the Chicken
Add the sliced chicken thighs to the pot. Sauté until just browned on the outside, about 3–4 minutes. It doesn't need to be fully cooked yet.
Add the Broth and Coconut Milk
Pour in the chicken broth and coconut milk. Stir well to combine. Bring to a gentle boil, then reduce to a simmer.
Season the Soup
Add the fish sauce and Thai chilies (if using). Let the soup simmer for 10–12 minutes, allowing the flavors to meld and the chicken to cook through.
Add Lime and Herbs
Stir in the lime juice and fresh basil leaves just before serving. Taste and adjust with more lime juice or fish sauce as needed.
Serve Hot
Ladle the soup into bowls and garnish with extra basil, lime wedges, and optional scallions or bean sprouts.
Notes
Use a Spoon to Peel Ginger: It’s quicker and minimizes waste.Smash Lemongrass First: Helps release flavor.Don’t Overboil the Coconut Milk: Keep it at a gentle simmer.Basil Goes In Last: Preserves its aroma and flavor.