Nanny's Irish Leek Soup

In a large saucepan melt butter and add leeks and onions. Cook, covered, until vegetables are tender, stirring occasionally. Add potatoes and broth and simmer covered for 40 minutes. Add sour cream and heat to serving temperature but do not boil. Season with pepper and serve at once.

Your Nanny's Irish Leek Soup is ready. Bon appetit!