Melt butter in a Dutch oven over medium heat. Add carrots, potato, onion, and celery, then stir in chicken broth and ginger. Cover and cook, stirring occasionally, until vegetables are tender, about 30 minutes. Uncover and cool for 15 minutes.
Transfer soup in batches to a food processor; blend until smooth. Return soup to the Dutch oven and stir in cream, curry powder, salt, and pepper. Cook over low heat until heated through, about 10 minutes.
Notes
Recipe Tips
If soup is too thick after adding cream, dilute it with small amounts of water until desired consistency is reached.You can also purée soup in a large bowl using a hand mixer if you don't have a food processor.