Hearty Lentil And Ham Soup

Ingredients
1 leftover smoked ham bone or 2 smoked ham hocks
1 pound lentils (about 2 1/2 cups), picked over and rinsed
1/2 pound mushrooms, chopped (about 3 1/2 cups)
3 onions, chopped coarse
1 cup chopped carrot
1 cup chopped celery
1 cinnamon stick
1 bay leaf
3 1/2 cups beef broth
8 cups water

Directions
In a 6- to 8-quart kettle combine all ingredients and simmer soup, covered partially, stirring occasionally, 1 1/2 hours. Discard bay leaf and cinnamon stick and remove meat from bone or hocks. Chop meat and stir into soup.