Roasted Cauliflower & Leek Soup

This cauliflower leek soup is easy to make, but you'd never guess it from the taste - roasting & blending the veggies makes it flavorful & satisfying.

Roasted Cauliflower & Leek Soup

Thank you all SO much for your ideas & suggestions of what to make with my giant cauliflower. You had so many creative ideas, and I just loved reading through them all.

Last night, we curled up on the sofa with this creamy roasted cauliflower & leek soup. (Note: I used cashews for the cream part – if you’re nut-free, check out thisΒ creamy vegan cauliflower soup recipe.) This process might look subtle, but roasting the cauliflower, leeks & garlic brings out some pretty big flavors… and in a surprisingly little amount of time. The short version of this recipe is this: Roast. Blend.

(But I promise, it tastes fancier than that).

Roasted Cauliflower Leek Soup

Thanks to so many of you for commenting with the leek & cauliflower soup idea… I went with this cashew cream idea suggested by Alisa. With the “toss it all in the oven” method (and paprika addition) as suggested by Anouk.


4.9 from 9 reviews
Roasted Cauliflower & Leek Soup
 
This creamy vegan cauliflower leek soup is a breeze to make - just roast & blend! I love it with a hunk of crusty bread on the side.
Author:
Recipe type: Soup
Serves: 3 as a main, 4-5 as a starter or side
Ingredients
  • About 2 cups chopped cauliflower
  • 2-3 leeks, white and very light green parts, chopped (about 1 to 1½ cups)
  • 2 garlic cloves
  • Extra-virgin olive oil, for drizzling
  • ½ cup raw, unsalted, un-roasted cashews, soaked overnight* (see note)
  • 1½ teaspoons miso paste (or just salt if you don't have any)
  • Leaves from a few sprigs of marjoram or thyme
  • 3 cups water
  • 2 tablespoons more olive oil (to blend into the soup)
  • ⅛ teaspoon smoked paprika (or more to taste)
  • Squeeze of lemon
  • Sea salt and fresh black pepper
  • Red pepper flakes (optional)
  • Splash of white wine vinegar or champagne vinegar, at the end (especially if you made yours too spicy like I did)
Instructions
  1. Preheat the oven to 400 degrees. Spread the cauliflower, leeks, and garlic on a baking sheet. Drizzle with olive oil and sprinkle with a few pinches of salt & pepper. Roast for 20-30 minutes, rotating halfway through. Remove when everything is starting to turn golden, but before the leeks are burning (if a few get too charred, it's ok, just pick them out later).
  2. Add to your blender the veggies you just roasted, drained cashews, marjoram leaves, miso paste, a squeeze of lemon and 1½ cups water. Blend until pureed. Add the 2 tablespoons olive oil, paprika, and the remaining 1½ cups water. Blend again. Taste and adjust seasonings.
  3. Pour into a medium saucepan and heat just until the soup is warm. Stir in a little more water if it's too thick. Serve with bread on the side.
Notes
*Be sure to use plain raw cashews or your soup will taste too much like cashews. If you're using a high speed blended (vitamix or blendtec), you could get away with soaking your cashews for less time because the blender will liquify everything thoroughly anyway.

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71 comments

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  1. Shauna from shecooksmacro.com
    01.14.2013

    yummy! that looks delish. Will definitely give this a whirl!!

    • jeanine
      01.14.2013

      thanks! (btw, I’ll be trying your recipes out too – thanks so much for posting, I was so glad to be introduced to your blog!)

  2. What a fun idea with the idea contest. This soup looks and sounds just delightful — and I love the cashews for creaminess instead of regular cream (which is usually too heavy for my stomach)!

  3. Jennifer from blog.jchongstudio.com
    01.14.2013

    nom nom trying this tonight

  4. Anouk
    01.14.2013

    Lovely! Funky twist – adding the cashews. My first try going ‘nuts’ was inspired by your broccoli pistachio soup πŸ™‚

    • jeanine
      01.14.2013

      oh so glad! I know it’s a weird concept at first – the whole nut/cheese thing… thanks so much for the recipe inspiration!

  5. Chiara from lacucinadellostivale.blogspot.it
    01.14.2013

    It looks so delicious!!

  6. I LOVE roast and blend soups, so easy, but so so good! I wonder if I could sneak this past my cauliflower hating mister : )

    • jeanine
      01.14.2013

      well you certainly can’t see any cauliflower in it… I won’t tell if you won’t πŸ™‚

    • B
      02.27.2013

      Do a mix of potatoes and cauliflower. Then he might not know.

  7. Eileen from hampiesandwiches.blogspot.com
    01.14.2013

    Yay for cauliflower & leek! I just made a soup a lot like this right before christmas. I didn’t roast anything, though–that sounds like a perfect way to jazz it up!

  8. i love leeks and i love cauliflowers, this soup i most definitely will have to try soon! looks delish.

  9. Yum! Love roasted cauliflower. So much flavour, yet so simple. This looks wonderful.

  10. Ashley from edibleperspective.com
    01.14.2013

    Okay. I’m pretty positive that we are food twins. Cauliflower week? Sign me up! I’m hooked on it right now, much more so than in the past. Can’t wait to see what you come up with!

  11. Alisa
    01.15.2013

    I loved seeing your take on those ingredients…delicious! πŸ™‚ and beautiful photos, as always.

  12. adorable blog!
    love this soup, one of my favorites ever.. and love that white cocotte!! where did you get it?

  13. This looks really good. Perfect for a chilly evening!

  14. Nina from toohottieforthatbody.com
    01.15.2013

    Oh this came at the perfect time! I need a new soup to warm up my soul after this frigid week. I’ll have to make it when my carnivorous husband goes back to the firehouse to please the tween who wants to be a vegetarian.

  15. Wonderful! I just taught my sister to make creamless potato-leek soup — big hit with her kids — but I’ve been looking for a version with more veggies and less starch. Will definitely be making and sharing this one!

  16. Alison from paperwhitesblog.blogspot.com
    01.15.2013

    YUM! absolutely making this this week!!

  17. Alison from paperwhitesblog.blogspot.com
    01.15.2013

    PS: how to soak cashews? (and what does that do)?

    • jeanine
      01.16.2013

      Hi Alison, sorry that wasn’t clear, I’ll go add some more explanation into the recipe. If you soak them ahead of time, they’ll be creamier when you go to blend them. Some say you need to soak for 2-6 hours, but I find I can get away with less time (or sometimes none) because I use a Vitamix blender. You’d benefit from more soaking time if you’re using a less powerful blender.

      • Alison from paperwhitesblog.blogspot.com
        01.16.2013

        Thank you so much! Excited to learn a new technique/trick!

      • Jacqueline
        02.25.2013

        I’m trying this without the cashews because I have everything else BUT that, I can’t get to the store, and if I wait any longer my leaks are going to go bad… So I may substitute some soy milk or (horribly bad for you) vegan sour cream that I do have??? Haven’t decided, going to see what I’m working with first when the veggies are done roasting. Wish me luck! lol

        • jeanine
          02.26.2013

          ok let me know how it goes/went!

  18. Julia
    01.15.2013

    I made this last night! I almost never make soups because, to me, they just don’t seem like the effort. But this recipe was so quick and easy, I had to give it a try – I’m so glad I did!

    I doubled the recipe – and then doubled the garlic (what can I say, I’m Italian) – but next time I’d scale back a little. I also didn’t have any cashews, so I subbed almond milk and it turned out great! I’d love to try this again and play around with different ingredients – it’s a great, simple recipe that I feel I could have fun with.

    I’m a very new reader (4 days) and I’ve already got a cache of your recipes I’m excited to try out. After the success with this one, I think I’ll get cooking sooner than later!

    Thanks!

    • jeanine
      01.16.2013

      I’m glad you liked it! Welcome!

  19. This looks great. I love cashews instead of the cream making it vegan. Also seems like such a good pairing with the cauliflower. Really would bring out the nuttiness.

  20. Liz B
    01.16.2013

    Darn it! I almost bought cauliflower and leeks at the fruit shop today, but opted out – silly me!

    This looks like what I wish I was having for dinner tonight!

  21. Good gracious your soups are amazing. Inspiring. After the roaring success of your sundried tomato soup, I am definitely making this tonight. And thank you for helping my resolution of going vegan for the month of January be delicious, warming and comforting.

  22. looks amazing – making an inspired version tonight!

  23. Christina
    01.24.2013

    Made this soup tonight and it was absolutely delicious! Soups like this have always intimidated me, but it was so easy and took no time to make. My boyfriend feel in love with it and my mom loved that I used cashews to make the creamy texture (she’s been telling to me for months that I should go gluten & dairy free for the health benefits). Anyways, thank you for the amazing recipe! Like you, I got a HUGEmongous cauliflower from Whole Foods. I’ve been thinking about giving FarmHouse a try though, seeing that we live in Austin as well!!

  24. Hi Jeanine, I just discovered your lovely blog and it’s fantastic! I really like adding raw nuts to soups to make them creamy without the use of dairy. I just posted a broccoli basil soup made with walnuts that is really yummy. Thanks for all the goodness you share!

  25. Cauliflower is one of my favorite veggies; seriously. This soup looks so silky and I love the use of cashews .

  26. Theresa
    02.10.2013

    So excited to have recently discovered your site! We made this soup last night and it is so delicious. Thanks for sharing!

    Theresa

  27. Annie from phoo-d.com
    02.11.2013

    I happened to have all the ingredients on hand (including cashews soaking in the fridge!) so I made this tonight. It was terrific and even our 2 year old loved it. I’m glad I doubled the quantity! You have a beautiful site.

  28. This is a great recipe. I like how you combined roasted leeks with the cauliflower and also used miso for an Asian touch. This inspired me to make something similar–a roasted cauliflower and leek soup with a broth similar to what you get in Tom Kha Gai soup (coconut, ginger and lime). I topped it with bacon crumbles, chopped peanuts and cilantro.

  29. Danielle
    03.05.2013

    Yum! I love mixing up a variety of roasted vegetables for soup. So creamy with such depth of flavor! I’m so glad I found this soup, completely delicious! I added a little bit of brown butter and seared scallops to the top and it was so rich and wonderful!

    • jeanine
      03.05.2013

      oh I bet scallops would be so delicious, glad you liked it!

  30. Tia
    03.21.2013

    I cant get to the store and I’m missing the Magorame, Thyme & white wine vinegar. Any substitudes? I really want to make this since I’m lil under the weather. Thanks

  31. Heather from snacktive.blogspot.com
    03.29.2013

    I had my parents over for dinner and cooked for them for the first time. I made this soup and we all loved it! It tasted so creamy and decadent. I brought leftovers to work today and am about to enjoy it again!

  32. nicole
    08.14.2013

    Have you tried to freeze this soup? I bought all the ingredients, but am not going to have space in our week to eat it πŸ˜‰

    • jeanine
      08.14.2013

      I haven’t… I think it would work but the texture might become less creamy after you thaw it (I’ve had that happen with similar soups). I’ll sometimes blend it again before I’m ready to eat so it’s super creamy again.

      If you try freezing this, let me know how it works out!

  33. Julie
    07.17.2014

    Can’t wait to try this recipe for dinner tomorrow! I couldn’t find unroasted cashews though so I bought roasted. Do I need to change anything before making?

  34. Michele'sInTheKitchen
    11.07.2014

    Beautiful recipe! I’m all over it. Think it’s okay/better if I use Dutch Oven to roast in? Thanks so much! Dinner is solved for tonight! Thank you!

  35. Mandy D from mandyshealthylife.com
    01.10.2015

    Hey!

    I made this soup and it was the bomb diggity! Thanks so much for the awesome recipes!!! My husband is loving all the new food from your site.

    Mandy

    • jeanine
      01.11.2015

      thanks Mandy, I’m so glad you liked this and the other recipes! – let me know some of your favorites?

  36. Keshia
    02.02.2015

    I absolutely love this recipe and have made it twice in the last two weeks. I was wondering if you have the nutrional info for the soup? It would be really awesome if you started posting them with your recipes!

  37. J
    02.20.2015

    If I use dried thyme or majoram how much should I use? 1 tsp?

    • jeanine
      02.20.2015

      I’d maybe start with 1/2 teaspoon (you could always add more to taste), or you can skip it if you want. The miso and the paprika will give it plenty of flavor.

  38. Holly
    02.28.2015

    This was really good! Thanks for the recipe. I just ran it on high in the Vitamix to heat it up…one less pan.

  39. Pey-Lih
    03.03.2015

    This soup looks so delightful! I will make it this weekend. My husband and I have tried a few of your recipes and they have turned out wonderful. So glad I found you through C+K. And Kate is awesome, too!

  40. This is going to be a perfect recipe to try when the leeks are ready in my garden! I love to use raw cashews for cream, frosting….you name it, they can do it! Beautiful photos! I hope to one day reach this level with my photography!

  41. Victoria
    11.27.2015

    I made this as a starter for Thanksgiving. It was fabulous! I multiplied the recipe using 3 heads of cauliflower, 7 leeks plus two regular onions and 2 cups of raw cashews to serve 20 people. I cut and roasted the veggies when I put the cashews in to soak, so all I had to do was whir it up in the blender the next day. Delicious, though it looked like cream of mushroom soup. Only change was to use homemade veggie broth instead of water. That may be why the soup was brownish.

    The acidity of lemon was crucial. The soup was rich but not heavy, well seasoned yet subtle. I used enough chili flakes to give it heat but not to make it spicy. Perfect for a lactose and gluten free offering and well received by everyone including kids. I garnished each bowl with a few leaves of thyme and some of the smaller bits of roasted cauliflower florets.

  42. Fiona Mackay
    12.08.2015

    Great for using the cauliflower and 2 leeks from my veg box, which have been sitting in our fridge for weeks. As partner has a nut allergy, was sorry to omit the idea of yummy cashew cream. Was going to use (probably not quite so suitable ) sunflower seeds, instead, but this soup still tastes creamy, silky and delicious without them.

  43. Just made this! Doubled the ingredients and added (canned) coconut milk, coriander, and a lot more lemon juice. I poured it over some cooked red potatoes and it was so wonderful. Thanks!

    • Jeanine Donofrio
      12.31.2016

      So glad you enjoyed it!!

  44. Kenzee
    01.06.2017

    Hi! This recipe looks delicious and I want to make it very soon, however, I am someone who cannot eat any nuts. What would you suggest I substitute in place for the cashews? Thanks in advance πŸ™‚

  45. Sue-Ann
    01.07.2017

    What a happy way for a cauliflower to be eaten!! Cashews definitely added to the joy! I served mine with sliced chorizo sausage that I cheerfully roasted with the cauliflower (local supermarket makes a good chorizo) instead of adding the paprika. Can’t you just feel my happiness through the screen?!?!!!!

  46. Miriam
    01.07.2017

    I tried this today and it was delicious! I served it with a little white truffle oil on top – it was a match made in heaven! Thank you for this lovely recipe πŸ™‚

  47. Amber
    03.09.2017

    I made this for dinner last night. I could not believe how easy it was! I did not remember the cashews in time though, and I only have a Ninja (not the blender, the ice crusher/food processor) so I skipped that part. But put in half a cup of almond milk. It was super delicious! And since I’m sick, I used 6 cloves of garlic. It wasn’t overpowering. I’m so glad I made this! Thank you!

  48. Carina
    05.08.2017

    Yes!! this looks and sounds so delicious and it’ll be dinner tonight, I just put the cashews in to soak πŸ™‚ Thank you.

  49. Roxy b from roxyborger.com
    06.04.2019

    Yum! Really good flavor and good balance of comforting yet not too heavy. I ended up needing 1c more water (I actually used homemade veggie broth). Thanks for great recipe.

    • Jeanine Donofrio
      06.07.2019

      Hi Roxy, I’m so glad you enjoyed the soup!

A food blog with fresh, zesty recipes.
Photograph of Jeanine Donofrio and Jack Mathews in their kitchen

Hello, we're Jeanine and Jack.

We love to eat, travel, cook, and eat some more! We create & photograph vegetarian recipes from our home in Chicago, while our shiba pups eat the kale stems that fall on the kitchen floor.