Leek and Potato Soup

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Leek and Potato Soup

Ingredients

2tablespoons butter
1 tablespoon olive oil
3 large leeks (white and pale green parts only), halved lengthwise, thinly sliced (about 4 1/2 cups)
2 large russet potatoes (about 18 ounces total), peeled, diced
5 cups chicken stock or canned low-salt broth
2 tablespoons chopped fresh chives
Preparation

Melt butter in heavy large saucepan add olive oil over medium heat. Add leeks; stir to coat with butter. Cover saucepan; cook until leeks are tender, stirring often, about 10 minutes. Add potatoes. Cover and cook until potatoes begin to soften but do not brown, stirring often, about 10 minutes. Add stock. Bring to boil. Reduce heat, cover and simmer until vegetables are very tender, about 30 minutes.
Puree soup in batches in processor until smooth. Return to saucepan. Thin with additional stock if soup is too thick. Season with salt and pepper. (Can be prepared 1 day ahead. Cover and refrigerate.) Bring soup to simmer. Ladle into bowls. Garnish with chives and serve.