Working in batches, carefully transfer the roasted vegetable mixture to a blender, adding small amounts of chicken broth to facilitate a smooth, velvety puree. Once each batch is transformed, transfer it to a large pot. Pour in the remaining chicken broth, creating a harmonious blend. Season with additional salt, pepper, and curry powder to your liking, tailoring the flavors to your personal palate. Gently stir in the half-and-half and cooking sherry. Heat over medium heat until the soup is warmed through, being careful not to let it boil. (15 minutes)