Authentic Thai Recipe Ingredient: Coriander Root Coriander Root รากผักชี (Rak phak chi; lak pak chee) The roots of the coriandrum sativum (coriander root, rak phak chi) are often used in Thai curry pastes and certain soups such as Tom yam gung. Browse Ingredients by Category: VegetablesHerbs and Spices (Fresh)Herbs and Spices (Dry)Roots and RhizomesMeat and PoultryFish and SeafoodMushrooms and FungiFlowers and Tree LeavesFruits and NutsStaple FoodsChili Pastes and CurriesSauces and CondimentsInsects