Step 1

Preheat the oven to 350°. In a medium saucepan, combine the carrots with the zest and juice and 1/4 cup of water. Season with salt and bring to a boil. Cover and simmer over moderate heat until the carrots are very soft, about 30 minutes. Discard the zest. Transfer the carrots and any liquid to a blender and puree until very smooth.