Wash leeks well. Hold under running water and separate the leaves, rinsing well. Chop roughly.
Heat coconut oil in large sauce pan, add leeks, cauliflower and onion. Saute for 2 minutes.
Add broth, bring to boil then reduce to simmer for about 20 minutes or until all veggies are tender.
Allow to cool, then puree until smooth using a blender. Start adding coconut milk during blending, a little at a time until you reach the desired consistency
Notes
Depending on the consistency of your soup, you may not need to add the coconut milk.If you do not like coconut milk, try almond milk