In a heatproof bowl, add the chopped cilantro, Thai chili (if using), green onion, crushed garlic, chili flakes, and sesame seeds.
Heat 2 tbsp oil until it’s hot but not smoking, then carefu lly pour it over the ingredients. This releases an intense fragrance and enhances the flavors.
Stir in the peanut butter, soy sauce, rice vinegar, chicken powder, sugar, and water. Mix well until smooth and set aside.