Cauliflower Cheddar Bisque

Ingredients:
1 1/2 Tablespoons butter
1 medium onion, diced
1 stalk celery, diced
2 cups low-fat milk (or your choice of milk)
2 cups chicken broth
1 cup water
1 head cauliflower, chopped into florets (about 6 cups)
1/2 teaspoon kosher or sea salt
1/2 teaspoon ground black pepper
2 teaspoons Dijon mustard
4 oz. cheddar cheese

Directions:
Saute onions and celery in butter until tender. Add liquid ingredients, cauliflower, salt, pepper, and mustard and bring to a boil. Reduce heat and simmer until cauliflower is tender. Remove from heat and cool slightly. Using slotted spoon, remove 4 cups of the vegetables and set aside. Working in batches, carefully transfer the remainder of the soup and cheese to blender and secure lid. Select "Sauces" or blend on a Medium to Medium-Low speed for 30 seconds. Combine vegetables with creamed soup and garnish with parsley, shredded cheese, or bacon.

Found at http://www.blendtec.com/recipes/cauliflower-cheddar-bisque