Steps
1. Peel and roughly chop the garlic and chili.
2. Pound garlic and chili together in a mortar and pestle to form a rough paste; avoid making it too smooth to maintain texture.
3. Transfer the paste to a small bowl.
4. Add lime juice and fish sauce to the paste, stirring well.
5. Stir in the palm sugar until it fully dissolves.
6. Gently fold in chopped coriander leaves and roasted rice powder if using.
7. Taste and adjust lime, chili, or sweetness as needed; the sauce should be sharp, spicy, salty, and just barely sweet.
8. Serve immediately for best flavor, as it loses brightness after 30 minutes.