- 1 medium onion, finely chopped
- 3 tablespoons unsalted butter
- 1 1/2 lb carrots, sliced 1/8 inch thick (4 cups)
- 4 cups water
- 1/8 teaspoon salt
- 1/4 teaspoon black pepper
- large pinch of ground cloves
- 1 cup fresh orange juice
- 2 teaspoons fresh lemon juice
- Garnish: fresh mint leaves
- Cook onion in butter in a 3- to 4-quart heavy saucepan over moderately high heat, stirring, until golden, about 3 minutes. Add carrots, water, salt, pepper, and cloves and simmer, covered, until carrots are very tender, about 15 minutes.
- Purée soup in 3 batches in a blender (use caution when blending hot liquids) until very smooth, about 1 minute, transferring to a bowl. Stir in orange and lemon juices.
- Chill soup, covered, until cold, at least 2 hours.