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Vegan cauliflower-onion soup

Don’t let the word “vegan” in the title make you think that soup is in any way a lesser version of another recipe! Every bowl of this cauliflower-onion soup is rich, hearty, full-flavored, and altogether delicious.

Cauliflower soup dinner

Super smooth and a beautiful pale yellow color, this soup looks especially amazing when you top it with parsley and walnuts, because the color and texture of those garnishes really pop.

Whether you’re looking for a winter warmer-upper or a dish to serve as a starter for your Thanksgiving or Christmas dinners, this recipe is a winner.

Vegan cauliflower-onion soup

GET THE REST OF THE RECIPES featured on our Thanksgiving Day feast menu – including step-by-step video and photos!

Vegan cauliflower-onion soup

Yield 8


  • 2 tablespoons olive oil
  • 2 sweet white onions, chopped
  • 2 garlic cloves, minced
  • 3 celery stalks, sliced
  • 2 thyme sprigs
  • 1 teaspoon salt
  • 1/4 teaspoon white pepper
  • 1 large head cauliflower, cut into cubes
  • 6 cups vegetable broth
  • 2 tablespoons walnuts, toasted (optional garnish)
  • 2 tablespoons parsley, minced (optional garnish)


  1. Pour the olive oil in a large Dutch oven or soup pot and warm over low heat.  
  2. Add the onions, garlic, celery, thyme, salt,  and  white pepper. Heat on medium.  Stir and cook until the mixture glistens with oil, then cover the pot and cook lowering the heat,  stirring frequently.  Cook for about 20 minutes.
  3. Add the cauliflower into the pot and pour in the broth.  
  4. Bring to a boil, reduce the heat so that the broth simmers gently and cook, uncovered, for another 20 minutes or until the cauliflower is very soft.
  5. Puree the soup in batches in a blender, or use an immersion blender.  This soup is best when it is very smooth.
  6.  Add salt and pepper to taste.  
  7.  Serve garnished with a few toasted walnuts and a pinch of minced parsley.

Note:  May be refrigerated after step 6, and reheated and garnished when ready to serve.

Vegan cauliflower-onion soup recipe

Vegan cauliflower-onion soup

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