Creamless Cream of Cauliflower soup

Ingredients:

Canola Oil - 2 tsp
Onion - 1
Celery - 2 ribs
Cauliflower- 1 small cut into florets
Medium baked potato -1 
Rubbed Sage - 1 tsp
Dried Thyme -1 tsp
Dry mustard - 1 tsp
Celery seed - 1 tsp
Fat free vegetable broth - 4 cups
Salt - 1/2 tsp
Pepper powder - 1/4 tsp
Raisins - 3 tsp

Method:

1) Heat oil in a  pan and add chopped onions,celery and cook till golden brown for 5 minutes.
2) Add the cauliflower florets and diced potato and cook , stirring for 1 minute.
3) Sprinkle sage, thyme,mustard and celery seed over the vegetables and stir well and cook for about 30 seconds.
4) Add vegetable broth and bring to simmer. Cover,reduce heat to low,and simmer until potato and cauliflower are soft when pierced with a fork for about 15 minutes.
5) Switch off the flame and let it cool.
5) Working in batches if necessary puree the soup in a food processor fitted with a chopping blade or in a  large blender.
6) Return the puree to the sauce pan and cook until heated through about 1 minute.
7) Season with salt and pepper,ladle into bowls and serve.