Heat oil in a large saucepan over medium-high heat. Add shallots; saute 3 minutes or until tender. Add potato, carrots, ginger, and curry; cook 2 minutes. Add broth; bring to a boil. Cover, reduce heat, and simmer 25 minutes or until vegetables are tender; stir in salt.
Pour half of soup in a food processor; pulse until smooth. Repeat procedure with remaining soup.