Celeriac, Leek and Apple Soup

    * 1 tbsp olive oil
    * 3 cups sliced leeks
    * 5 cups (approx. 3 lbs) celeriac, chopped in approx 1 inch cubes
    * 1 large apple, peeled and cored, and coarsely chopped
    * 5 cups chicken broth or vegetable broth (or more if you would like it thinner. you can make this decision at the end when you're blending the soup)
    * 1/2 cup half and half
    * salt and pepper, to taste
 
 
In soup pot, heat olive oil. Add leeks and cook, approx 3 minutes, or until leeks begin to soften. Add celeriac, apple, and chicken broth. Bring to a simmer and cook 30 minutes, stirring occasionally. Using an immersion blender, blend until smooth. Add the half and half and blend. (The soup will be thick. If you'd like it thinner, add some more broth or water) Season with salt and pepper, to taste.