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Home » Main Dishes » Whole Roast Cauliflower with Tomato Mushroom Sauce

Whole Roast Cauliflower with Tomato Mushroom Sauce

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A whole roast cauliflower served a with rich tomato mushroom sauce is a gourmet meal that’s both tasty and nutritious.

Struggling to find a vegan centrepiece dish that’s both nutritious and mouth-wateringly good?

How about this whole roast cauliflower with a rich tomato mushroom sauce? This wholesome dish will light up your dining table and impress your guests – and it’s easy to make!

A whole roasted cauliflower on an oval china serving platter, surrounded by and topped with tomato mushroom sauce, and sprinkled with chopped parsley. Part of a serving spoon can be seen next to the platter, and both are on a black cloth.

On this page...

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  • Memories of cauliflower
  • The Rise of Cauliflower in Gourmet Cuisine
  • Nutritional benefits of cauliflower
  • Cooking cauliflower
  • Preparing your cauliflower
  • Ingredients in whole roasted cauliflower with tomato mushroom sauce
  • How to make a whole roast cauliflower
  • Making the Tomato Mushroom Sauce
  • Serving whole roast cauliflower with tomato mushroom sauce
  • Get roasting!
  • Whole roast cauliflower with tomato mushroom sauce
  • More delicious cauliflower recipes
  • Whole Roast Cauliflower with Tomato Mushroom Sauce FAQs

Memories of cauliflower

Cauliflower with tomato mushroom sauce was something of a staple Shabbat side dish when I was a child. I particularly remember those occasions when as a treat, we were allowed to have our lokshen kugel on the same plate with our main course. The unlikely combination of sweet, fruity lokshen kugel with savoury cauliflower and rich-and-tangy tomato mushroom sauce was memorably delicious!

However, the cauliflower of my youth was always steamed rather than roasted. While the flavour is still delicious, I much prefer the texture that roasting imparts. The cauliflower retains more ‘bite’, which provides a toothsome contrast to the soft, velvety sauce.

An overhead image of a whole roasted cauliflower on a china serving platter, surrounded by and topped with tomato mushroom sauce, and sprinkled with chopped parsley. Part of a serving spoon is visible on the left.

The Rise of Cauliflower in Gourmet Cuisine

Cauliflower was for many years overlooked as a bland side dish or accompaniment. However more recently it has been given centre stage and allowed to shine! As a result, cauliflower is now seen as a mainstay of gourmet cuisine – and gorgeous showstoppers like this whole roasted cauliflower with tomato mushroom sauce are enjoying their time in the limelight.

Nutritional benefits of cauliflower

Cauliflower, like other cruciferous vegetables, has outstanding nutritional properties. Rich in vitamin C and potassium, it’s also a good source of numerous B vitamins and minerals, all essential for health and wellbeing.

Cauliflower also contains antioxidants, including Sulforaphane, which has been shown to improve immunity, balance hormones, and reduce symptoms of PMS, as well as having a positive effect on mental health. The vegetable is also a great source of dietary fibre which is essential for a healthy digestive system.

A whole roasted cauliflower on a china serving platter, surrounded by and topped with tomato mushroom sauce, and sprinkled with chopped parsley.

Cooking cauliflower

This tasty vegetable has the ability to adapt to numerous cooking techniques. It can be eaten raw in salads, as well as steamed, boiled, mashed, riced, roasted or served as ‘steaks’, among other things! Cauliflower’s subtle and delicious flavour makes it an excellent canvas for a variety of seasonings and sauces.

It’s easy to transform this tasty, healthy vegetable into hearty, satisfying dishes that can stand proudly at the centre of a meal, making cauliflower a great choice for vegetarian and vegan menus.

A whole roasted cauliflower on a china serving platter, surrounded by and topped with tomato mushroom sauce, and sprinkled with chopped parsley. The platter sits on a black cloth.

Preparing your cauliflower

Preparing a fabulous whole roast cauliflower begins with selecting the right cauliflower. Look for a firm, creamy-white head with tightly packed florets and undamaged green leaves. This indicates freshness and quality, essential for achieving the perfect texture and flavour.

Before roasting, the cauliflower must be thoroughly cleaned. Gently remove any outer leaves and trim the stem, allowing the cauliflower to sit flat on a baking sheet. Submerge the cauliflower completely in a bowl of lightly salted and acidified water. Place a plate or another weight on top to keep the cauliflower submerged for around 8-10 minutes.

Lift the cauliflower out of the water and allow it to drain. If there is any dirt, debris or insects in the water, repeat the soaking process until no more appear. Once the water is clear, give the cauliflower a good rinse, and it is ready to cook!

A whole roasted cauliflower on a china serving platter, surrounded by and topped with tomato mushroom sauce, and sprinkled with chopped parsley.

Ingredients in whole roasted cauliflower with tomato mushroom sauce

The ingredients in this delightful dish are all fairly straightforward, standard items. However they combine to make something truly outstanding! To cook this yourself, you will need:

  • Cauliflower – of course! Choose a medium-sized, firm, creamy-white cauliflower for best results. Avoid those with discoloured spots or limp leaves as these are signs that the cauliflower is not fresh.
  • Seasonings – I use salt, pepper and garlic powder for a simple but delicious flavour.
  • Olive oil – for roasting, and in the sauce.
  • Onions – the basis of any good sauce!
  • Mushrooms – add a rich flavour that complements the cauliflower.
  • Tinned tomatoes – I use ready-chopped tomatoes but you can use whole ones and break them up with a spoon as the sauce simmers.
  • Herbs – bay leaf and thyme or oregano, or the herbs of your choice!
Ingredients for making a roasted cauliflower with tomato mushroom sauce - cauliflower, olive oil, garlic powder, salt and pepper, mushrooms, onions, tinned tomatoes, bay leaves, oregano.

How to make a whole roast cauliflower

After washing, gently pat the cauliflower dry before brushing with olive oil. This ensures it will roast evenly and turn a beautiful golden brown in the oven. I like to gently season with salt, pepper, and a sprinkle of garlic powder to bring out the natural umami flavours.

Roast the cauliflower in a preheated oven at around 200°C (400°F) until the exterior is crispy and golden, and a knife inserted into the centre meets no resistance – about 45 minutes to an hour depending on the size of your cauliflower. Let it rest for a few minutes outside the oven before serving – this helps the flavours to settle and makes your cauliflower easier to cut.

To reduce the cooking time in the oven, you can microwave the cauliflower for a few minutes before continuing as above with oil, seasoning and roasting.

Whole cauliflower with seasonings in a baking tin, before and after roasting.

Making the Tomato Mushroom Sauce

The tomato mushroom sauce is a rich, aromatic companion that perfectly complements the savoury flavour of the roasted cauliflower. The earthiness of mushrooms and the tangy sweetness of the tomatoes work fantastically alongside the comforting savoury depths of the roasted cauliflower.

I sauté fresh mushrooms with thinly sliced onions and garlic in a generous amount of olive oil, before adding chopped tomatoes and leaving to simmer. Fresh herbs like oregano or thyme add a perfect fragrant note that really elevates the sauce.

The sauce should reach a rich and thick texture after simmering for about 20 to 30 minutes. Its robust flavour profile makes it the ideal complement to the whole roasted cauliflower, ensuring that every bite is a delightful blend of tastes and aromas.

A whole roasted cauliflower on an oval china serving platter, surrounded by and topped with tomato mushroom sauce, and sprinkled with chopped parsley, seen from above. A serving spoon is next to the platter, and both sit on a black cloth.

Serving whole roast cauliflower with tomato mushroom sauce

With your whole roast cauliflower and tomato mushroom sauce ready, the final step is to combine them into a delightful centerpiece that’s as appealing to the eye as it is to the palate. First, carefully transfer your roasted cauliflower onto a large serving platter. Then spoon the sauce around the base of the cauliflower, and pour a little over the top, ensuring a few florets remain uncovered.

The golden crust developed during roasting should offer a striking contrast to the vibrant red of the tomato mushroom sauce. Garnish with fresh herbs like parsley or basil, to add a splash of colour and a fresh and enticing aroma.

I like to bring the completed dish to the table then use a sharp knife to cut and serve the cauliflower. Alternatively, you can slice it into wedges at the table and allow diners to help themselves from the platter.

This whole roasted cauliflower in its rich, flavoursome sauce, is a satisfying, wholesome meal, and showcases the beauty and depth of flavours that a vegan main dish can provide.

Get roasting!

I hope you agree that this recipe combines simplicity and elegance. Roasted cauliflower with tomato mushroom sauce is a delicious dish where nourishment meets gastronomy, proving that healthy and nutritious dishes can also be feast-worthy!

Whole roast cauliflower with tomato mushroom sauce.

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📖 Recipe

A whole roasted cauliflower on a china serving platter, surrounded by and topped with tomato mushroom sauce, and sprinkled with chopped parsley. The platter sits on a black cloth.

Whole roast cauliflower with tomato mushroom sauce

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A gorgeous vegan centrepiece of savoury whole roasted cauliflower in a rich and earthy tomato and mushroom sauce.
5 from 1 vote
Print Recipe Pin Recipe Save Saved!
Prep Time 15 minutes mins
Cook Time 1 hour hr
Total Time 1 hour hr 15 minutes mins
Course Appetizer, Main Course
Cuisine Vegan, Vegetarian
Servings 4
Calories 153 kcal

Ingredients
  

For the whole roasted cauliflower

  • 1 medium-large cauliflower
  • 1-2 tablespoon extra virgin olive oil
  • ¼ teaspoon salt
  • ¼ teaspoon ground black pepper
  • ½ teaspoon garlic powder

For the tomato mushroom sauce

  • 1 tablespoon dried mushrooms (optional)
  • 1 medium onion
  • 50 g small mushrooms
  • 2 tablespoon extra virgin olive oil
  • 400 g tinned chopped tomatoes
  • 1 teaspoon oregano or thyme
  • 1 bay leaf
  • salt and pepper to taste
  • chopped parsley to garnish (optional)

Instructions
 

  • 1 medium-large cauliflower
    Carefully trim the leaves from around the cauliflower. Trim the stalk so that the head will stand up. Wash well by soaking the whole head of cauliflower in salted water then rinsing in cold water. Once clean, pat dry and place in a roasting tin. Preheat the oven to 180℃ (350℉).
  • 1-2 tablespoon extra virgin olive oil, ¼ teaspoon salt, ¼ teaspoon ground black pepper, ½ teaspoon garlic powder
    Brush the cauliflower all over the with the olive oil, and sprinkle with salt, pepper and garlic powder. Roast in the preheated oven for 45 minutes to an hour (or longer depending on the size of your cauliflower) until a sharp knife inserted into the centre meets little resistance.
    (To reduce the cooking time in the oven, you can microwave the cauliflower for 5 minutes before brushing with oil, seasoning and roasting as above.)
  • 1 tablespoon dried mushrooms (optional)
    Meanwhile, make the sauce. Place the dried mushrooms, if using, in a small bowl, and cover with boiling water. Set aside.
  • 1 medium onion, 50 g small mushrooms
    Peel and thinly slice the onion, and thinly slice the mushrooms.
  • 2 tablespoon extra virgin olive oil, 400 g tinned chopped tomatoes
    Heat the olive oil in a saucepan over a medium heat. Add the sliced onions and cook for two minutes, then add the mushrooms and continue to cook, stirring occasionally, until they are softened and starting to caramelise – 6-10 minutes. Add the tomatoes and stir well. Cover, and reduce the heat to a gentle simmer.
  • 1 teaspoon oregano or thyme, 1 bay leaf, salt and pepper to taste
    Drain the dehydrated mushrooms, if using. Chop finely and add to the saucepan. Add the oregano or thyme and bay leaf and mix well. Return the lid to the pot, and continue to simmer the sauce for around 20 minutes until thickened and cooked through – the colour will change from red to orange as the tomatoes cook. Season to taste with salt and pepper.

To serve

  • chopped parsley to garnish (optional)
    Remove the whole roasted cauliflower from the oven and carefully transfer to a serving platter. Spoon sauce around and over the cauliflower. Garnish with chopped parsley and bring to the table!

Nutrition

Nutrition Facts
Whole roast cauliflower with tomato mushroom sauce
Amount per Serving
Calories
153
% Daily Value*
Fat
 
11
g
17
%
Saturated Fat
 
2
g
13
%
Polyunsaturated Fat
 
1
g
Monounsaturated Fat
 
8
g
Sodium
 
280
mg
12
%
Potassium
 
443
mg
13
%
Carbohydrates
 
14
g
5
%
Fiber
 
3
g
13
%
Sugar
 
6
g
7
%
Protein
 
3
g
6
%
Vitamin A
 
226
IU
5
%
Vitamin C
 
12
mg
15
%
Calcium
 
50
mg
5
%
Iron
 
2
mg
11
%
* Percent Daily Values are based on a 2000 calorie diet.
Keyword cauliflower, garlic, mushrooms, onions, tomato
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More delicious cauliflower recipes

If you can’t get enough cauliflower, why not try:

  • Sephardic style cauliflower with tomato and dill
  • Vegan cauliflower and chickpea curry
  • Cauliflower with anchovy and garlic
  • Delicious roasted cauliflower chowder
  • Cauliflower with dill and tomato.
    Sephardic style cauliflower with tomato and dill
  • Cauliflower with anchovy and garlic.
    Cauliflower with anchovy and garlic
  • curried carrot and cauliflower fritters
    Curried cauliflower and carrot fritters
  • Roasted cauliflower and broccoli with warm olive couscous salad in a blue bowl.
    Spice-roasted cauliflower & broccoli with warm olive couscous salad

Whole Roast Cauliflower with Tomato Mushroom Sauce FAQs

Can roast cauliflower with tomato mushroom sauce be made ahead of time?

The whole roast cauliflower is best served immediately that it is cooked, as the texture will suffer if it is prepared ahead and reheated. However the tomato mushroom sauce can be prepared in advance, and actually benefits from being made ahead as this allows the flavours to meld and intensify.
Store the prepared sauce in an airtight container in the refrigerator for up to 3 days, then gently reheat it on the stove, thinning with a little water if necessary, before serving with the freshly roasted cauliflower.

How can I store leftovers of the whole roast cauliflower?

Leftover roast cauliflower should be stored in an airtight container in the refrigerator. It will keep for2-3 days. When ready to enjoy, reheat the cauliflower in the oven to preserve its texture, as microwaving may make it too soft or watery. Note that while the cauliflower is fine reheated, it really is best eaten when freshly prepared.

Does this dish suit different dietary needs?

Cauliflower with tomato mushroom sauce is naturally vegan and vegetarian, and is free from gluten-containing ingredients. It is also free from most major allergens, so is suitable for diners who are allergic to nuts, legumes, sesame, fish/shellfish, wheat, eggs and dairy.

What should I serve with this dish?

Whole roast cauliflower with tomato mushroom sauce pairs beautifully with a wide range of side dishes. I like to serve it with a fresh leafy green salad or simply prepared green beans, mange tout or other vegetables. A simple dish of seasoned chickpeas adds protein. Grains such as quinoa, rice, or couscous go well, or simply offer some crusty bread to soak up the lovely sauce. The choice of sides can also reflect seasonal vegetables or your personal preferences.

Close up image of a roasted cauliflower on a china serving platter, surrounded by and topped with tomato mushroom sauce, and sprinkled with chopped parsley. Part of a serving spoon is visible on the right.

More Main Dishes

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    Easy Sesame Noodles – cold, noodly deliciousness
  • Vegan Shavuot Recipes – traditional plant-based festive foods
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I’m Helen, Jewish mum, flexitarian kosher cook, and food blogger, and I love to share meat-free, delicious recipes with a British Jewish twist. Take a look around and see what you can discover!

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