Pour water into a pot over a medium heat. Toss in the garlic, coriander root, lemongrass, and galangal. Close the lid and gradually let it come to a boil.
As it bubbles, add fish sauce, light and dark soy sauces, white pepper, and palm sugar. Give it a stir, ensuring the sugar dissolves completely.
Once your broth is boiling again, arrange the chicken thighs in a single layer. They should be just over half-submerged in the liquid. Seal with the lid.
Switch the heat to low and let the chicken simmer slowly for 45 minutes. Halfway through, give it a flip.
After simmering, let the chicken thighs rest for several minutes, allowing the meat to soak up the juices. Serve chicken with rice.
Notes
Use the nutrition card in this recipe as a guideline.
Serve with rice and a dipping sauce like sweet chili sauce.
Skin-on and bone-in chicken thighs deliver the best results.
Place the chicken in a single layer to make sure all pieces cook evenly. Flip halfway through.
Use the leftover chicken broth to flavor your rice or other dishes.