Vegan cauliflower and leek soup

I bought a cauliflower and as always didn't know how to cook it, I also had leftover leeks and celery. I made a cauliflower and leek soup, with a bit of celery. Of course there was garlic involved, as well as a can of white kidney beans. After boiling everything in vegetable broth for about 40 minutes (I added the beans at the end since they were already cooked), I blended everything with the hand blender. The texture was that of a veloute, and it was just delicious. Highly recommended.

Ingredients:

2 tbsp olive oil

2 tbsp vegan margarine

1 head of cauliflower

1 leek

2 stalks of celery

1 clove of garlic

1/2 sweet onion

1 carton of vegetable broth

1 can of white kidney beans

Salt and pepper to taste