Rinse and cut entire cauliflower and boil for 20 minutes or until fork tender.
Once cauliflower is tender, remove from heat and strain, reserving about 1 cup of water.
Add cauliflower and reserved water in a blender. Be sure to place lid and remove the center topper to let steam out. Cover with towel and blend until smooth.
Pour soup back into pot, season with curry, turmeric, salt & pepper and stir. Adjust salt & pepper to taste and serve.
Notes
You can use spicy curry to turn up the heat in this soup. I sprinkled a bit of chile powder in mine but you can certainly turn it up!