How to Make It
Heat the oil in a large saucepan. Add the sliced carrots and ginger and cook over moderately high heat, stirring, until the carrots are crisp-tender and lightly browned, 6 to 7 minutes. Add the onion and cook until softened but not browned, about 2 minutes.
Add the chicken stock, water, coconut milk and curry paste to the saucepan and bring to a boil. Simmer over moderate heat until the carrots are tender, about 25 minutes. Strain the cooking liquid into another saucepan, reserving the solids; discard the ginger. Transfer the carrots to a blender and puree with 1 cup of the cooking liquid until very smooth. Return the puree to the cooking liquid, add the carrot matchsticks and cook until tender, about 3 minutes. Season with salt and pepper. Ladle the soup into bowls, sprinkle with the scallion, cilantro and basil and serve.