Roast Cauliflower Soup with Preserved Lemon & Miso

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This roast cauliflower soup is made zingy and bright with the addition of preserved lemon and given an umami hit with miso. This is the perfect warming soup for winter.

You can’t get better than a bowl of soup sometimes 🥣

Grey bowl of cauliflower soup on a blue surface

Close up of roast cauliflower soup topped with chilli oil on a beige cloth

This is such a good January detox soup. Not that I even really believe in the whole detox/new year new you nonsense but after a month of heavy eating and drinking I was so ready for going back to something resembling a vegetable this past week.

I have to be completely honest here and admit that this soup was 100% Will’s creation. He took it upon himself to make me lunch and came up with this concoction and it turned out to be completely delicious.

I was slightly apprehensive about the combination, especially the addition of preserved lemon which definitely needs to be used with caution to avoid it overwhelming everything. Everything actually works so well together though and it takes cauliflower soup from something a bit dull to something really special.

Grey bowl of creamy soup topped with chermoula

Overhead shot of roasted cauliflower soup drizzled with chilli oil on a blue background

Why we love this roast cauliflower soup…

We love that this is a vegetarian soup recipe so it’s great for when you’re cutting down on meat. You can even leave out the butter to make the whole thing vegan.

It’s such an easy recipe to make and most of it is hands off time so you can get on with something else while it’s cooking.

While the cauliflower works perfectly on its own in this soup you could add extra veggies if you want to to make it even healthier.

This is a really healthy recipe while still packed with flavour thanks to the miso and preserved lemon.

Two bowls of cauliflower soup on a blue surface in front of a white brick tile wall

Overhead shot of cauliflower and miso soup on a checked cloth

Roasted Cauliflower Soup Ingredients

This section is here to provide further tips and ideas for alternative ingredients. The full recipe and instructions are included in the recipe card at the bottom of the post!

Cauliflower: This is cut up and roasted until beginning to brown.

Herbs: Rosemary and bay leaf are added to the soup as it simmers.

Preserved Lemon: Just half a preserved lemon is finely chopped and added to the soup for a big hit of freshness.

Stock: Store bought or homemade stock is fine. If you’re not worried about it being vegetarian then chicken stock is really tasty.

White Miso: This adds a lovely umami saltiness to balance out the freshness.


Overhead shot of two bowls of cauliflower and preserved lemon soup on a checked cloth

Grey bowl of cauliflower soup topped with nigella seeds on a cloth

How to make cauliflower & miso soup

Roast the cauliflower: Cut the cauliflower into florets, toss with olive oil and plenty of salt then roast in the oven for 20-30 minutes.

Start the soup: Fry the rosemary and preserved lemon in olive oil and butter then add the onion, bay leaf and chilli flakes.

Finish and blend: Add the potato, cauliflower, stock and miso and simmer for 10 minutes. Blend until smooth and serve with a chilli sauce of your choice.

Equipment you need to make this recipe…


Overhead shot of two bowls of creamy soup on a checked cloth with spoons

Grey bowl of soup on a blue surface

Want more? Try these other soup recipes!

Overhead shot of cauliflower and miso soup on a checked cloth

Roast Cauliflower Soup with Preserved Lemon & Miso

This roast cauliflower soup is made zingy and bright with the addition of preserved lemon and given an umami hit with miso. This is the perfect warming soup for winter.
4.2 from 5 votes
Print Pin Rate
Course: Main Course
Cuisine: Mediterranean
Prep Time: 10 minutes
Cook Time: 45 minutes
Total Time: 55 minutes
Servings: 4 servings
Calories: 175kcal
Author: Amy Fulwood


  • 1 medium Cauliflower approx 800g cut into florets
  • 3 tbsp Olive Oil
  • 10 g Butter
  • 1 sprig Rosemary
  • 1/2 Preserved Lemon finely chopped
  • 1 Onion finely chopped
  • 1 Bay Leaf
  • Large pinch Chilli Flakes
  • 700 ml Vegetable Stock
  • 1 Potato approx 200g, cut into chunks
  • 1 tbsp White Miso
  • Chermoula/Chilli Oil to serve
  • Nigella Seeds to serve


  • Preheat oven to 250°C/480°F. Place the cauliflower florets into a bowl with 2 tbsp olive oil and a generous pinch of salt. Toss to combine, then spread on a baking sheet and put into the oven to roast for 20-30 mins, until the edges of the cauliflower are beginning to blacken.
  • Meanwhile melt together the butter and the rest of the olive oil in a saucepan. Add the rosemary sprig and preserved lemon and fry very gently until fragrant. Add the onion, bay leaf, and chilli flakes, and fry until the onion is translucent, about 8 mins.
  • Add the potato, roasted cauliflower, stock, and miso, bring to a boil, and simmer for about 10 mins or until the potato is cooked. Blend until smooth. Serve with a swirl of chermoula, harissa, or other chilli sauce and sprinkled with nigella seeds.
Nutrition Facts
Roast Cauliflower Soup with Preserved Lemon & Miso
Amount Per Serving
Calories 175 Calories from Fat 117
% Daily Value*
Fat 13g20%
Saturated Fat 3g15%
Cholesterol 5mg2%
Sodium 921mg38%
Potassium 479mg14%
Carbohydrates 13g4%
Fiber 4g16%
Sugar 6g7%
Protein 4g8%
Vitamin A 435IU9%
Vitamin C 71mg86%
Calcium 38mg4%
Iron 1mg6%
* Percent Daily Values are based on a 2000 calorie diet.


Nutrition information is an estimate and will vary depending on the exact ingredients used.
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  • Reply
    Lauren Vavala
    03/02/2021 at 6:56 PM

    5 stars
    This cauliflower soup sound so amazing. What a great idea to add lemon and miso – yum!

  • Reply
    Jacque Hastert
    03/02/2021 at 8:15 PM

    5 stars
    I love that you have added lemon and miso to this cauliflower soup. It really brings much more flavor to such a healthy and delicious soup.

  • Reply
    Genevieve | Fitty Foodlicious
    03/02/2021 at 8:22 PM

    5 stars
    This cauliflower soup looks perfect for the rainy weather Cali has been having!

  • Reply
    Emily Liao
    03/02/2021 at 8:31 PM

    5 stars
    The lemon and miso really added a punch of flavor to this soup! Loved it.

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