Sweet Potato Soup with Buttered Pecans

For the soup

• 3/4 cup Spanish onion- diced
• 1 cup finely chopped leek, washed well and drained
• 2 large garlic cloves, minced
• 3 large carrots, sliced thin (about 1 1/2 cups)
• 1 bay leaf
• 4 tablespoons unsalted butter
• 2 pounds (about 3 large) sweet potatoes
• medium size russet (baking) potato
• 5 cups chicken or beef broth plus additional for thinning the soup if desired
• 3/4 cup dry white wine
• 1 1/2 cups water

For the buttered pecans

• 3/4 cup chopped pecans
• 2 tablespoons unsalted butter

preparation

Make the soup:
In a kettle cook the onion, the leek, the garlic, and the carrots with the bay leaf and salt and pepper to taste in the butter over moderate heat, stirring, until the vegetables are softened. Add the sweet potatoes, peeled, halved lengthwise, and sliced thin, the russet potato, peeled, halved lengthwise, and sliced thin, the 5 cups broth, the wine, and the water, simmer the mixture, covered for 15 to 20 minutes, or until the potatoes are very tender, and discard the bay leaf. In a food processor or blender puree the mixture in batches until it is very smooth, transferring it as it is pureed to a large saucepan, add the additional broth to thin the soup to the desired consistency, and season the soup with salt and pepper. The soup may be made 1 day in advance, kept covered and chilled, and reheated.

Make the buttered pecans:
In a skillet cook the pecans in the butter with salt to taste over moderate heat, stirring occasionally, for 10 minutes, or until they are golden brown, and transfer them to paper towels to drain. The pecans may be made 2 days in advance and kept in a glass jar, after they have cooled.

Divide the soup among bowls and top each with pecans.