Authentic Thai Recipe Ingredient: Water caltrop Water caltrop กระจับ (Krachap; Gra jap) Also known as water chestnut. 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