It's an easy soup, based off of an Alfred Portales recipe (Gotham restaurant, NY). Quick to make, and great for a cold evening. You can made the soup ahead of time, it reheats really well.
½ stick of butter
1 chopped onion
2 garlic clove, sliced
1 large head of cauliflower, cut in to pieces
2 to 2 ½ cups broth, (your choice, chicken or veg) Amount will vary depending on how much cauliflower you have.
1 1/2 cups of dairy (milk for a lighter soup, cream for a richer soup.
Coarse kosher salt
Freshly ground white pepper
Melt butter heavy large saucepan over medium heat. Add onion and garlic. Sauté until onion is soft, about 5 minutes. Add cauliflower, broth, and cream. Bring soup to boil. Reduce heat to low, partially cover, and simmer gently until cauliflower is tender, about 18 minutes. Puree soup, either with a hand blender (my choice) or in small batches in blender until smooth. Return to same saucepan. Season soup with kosher salt and white pepper.