Creamy Roasted Cauliflower Soup

By Sam Pierce

Ingredients (~6 servings)

  • 1 large head of cauliflower (~3 lbs)
  • 3 tablespoons extra-virgin olive oil
  • 1 tablespoon unsalted butter
  • 1 large red onion, chopped
  • 3 cloves garlic, minced
  • 6 cups vegetable broth, low-sodium
  • 1 1/2 tablespoons fresh lemon juice
  • 1/2 teaspoon grated nutmeg
  • Diamond Crystal kosher salt, to taste
  • Freshly ground black pepper, for garnish
  • Fresh thyme, for garnish

Roasting the Cauliflower

The first step when you want to roast your cauliflower is to preheat your oven to 425F.

Then, line a large baking sheet with parchment paper.

Next, cut your cauliflower into smaller pieces about the same size so they’ll roast evenly.

Now toss your cauliflower pieces on a baking sheet and drizzle them with olive oil and some salt.

Then you want to spread them out evenly on the baking sheet, making sure you don’t overcrowd it; if the cauliflower pieces are too close together, they will steam instead of roasting!

If you do not have room for all of your cauliflower, use two separate sheets.

Roast your cauliflower for approximately 30 minutes, flipping halfway through.

Your cauliflower is fully cooked when it’s tender with golden brown edges.

Making the Soup

While your cauliflower continues to roast in the oven, heat up butter in a large pot (or Dutch oven) over medium heat.

Once your butter has melted, add your chopped onion and sauté for 4-5 minutes, stirring frequently until your onion has become translucent.

Once this happens, add your minced garlic and sauté for 1 additional minute.

The next step after adding garlic is to pour vegetable broth into the same pot as the onion and garlic.

Once your cauliflower has finished roasting, set aside some of those nicer looking florets for garnishing purposes.

You’ll then add the remaining roasted cauliflower directly to the broth with onions and garlic.

Over medium heat, bring to a simmer and continue cooking the soup for approximately 20 minutes or until the cauliflower is fully soft.

Smooth and Finish the Soup

Once the cauliflower soup is finished cooking, remove from heat.

Use an immersion blender (or carefully blend in separate portions with a traditional blender) until your soup becomes completely smooth.

After this, stir in fresh lemon juice and nutmeg.

Taste your mixture to see if there needs to be any added salt; if necessary, add salt to taste before serving.

Serve in individual bowls, garnished with the set-aside roasted cauliflower florets, a bit of cracked pepper, and a sprinkle of fresh thyme leaves.

Creamy Roasted Cauliflower Soup

Roasting cauliflower before turning it into soup gives it a nutty, caramelized flavor that you don't get from just boiling it. This recipe is creamy without using any cream; the texture comes from the blended cauliflower itself.
Print Pin Rate
Prep Time: 15 minutes
Cook Time: 50 minutes
Total Time: 1 hour 5 minutes

Ingredients

  • 1 large head of cauliflower ~3 lbs
  • 3 tablespoons extra-virgin olive oil
  • 1 tablespoon unsalted butter
  • 1 large red onion chopped
  • 3 cloves garlic minced
  • 6 cups vegetable broth low-sodium
  • 1 1/2 tablespoons fresh lemon juice
  • 1/2 teaspoon grated nutmeg
  • Diamond Crystal kosher salt to taste
  • Freshly ground black pepper for garnish
  • Fresh thyme for garnish

Instructions

  • Preheat oven to 425F and line baking sheet with parchment paper.
  • Cut cauliflower into even-sized florets and toss with olive oil and salt on baking sheet.
  • Roast cauliflower for 30 minutes, tossing halfway, until golden brown and tender.
  • Meanwhile, melt butter in large pot over medium heat and cook onion until translucent, 4-5 minutes.
  • Add garlic and cook 1 minute more.
  • Add vegetable broth to pot.
  • Reserve some roasted florets for garnish, add remaining cauliflower to pot.
  • Simmer soup for 20 minutes until cauliflower is very tender.
  • Blend soup until smooth with immersion blender.
  • Stir in lemon juice and nutmeg, season with salt to taste.
  • Serve garnished with reserved cauliflower, black pepper, and thyme.

Notes

For best roasting results, ensure cauliflower florets are spread in a single layer, using two baking sheets if needed.
Tried this recipe?Leave a comment below & let me know!