Kalyn's Kitchen

Roasted Cauliflower Slices with Red Pepper, Capers, and Olives

Roasted Cauliflower Slices with Red Pepper, Capers, and Olives are absolutely delicious for low-carb meatless dinner! And this tasty recipe is also dairy-free, gluten-free, and vegan! 

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Roasted Cauliflower Slices with Red Pepper, Capers, and Olives finished dish on serving plate

Roasted Cauliflower Slices with Red Pepper, Capers, and Olives is one of my favorite cauliflower dishes that I think is perfect for this time of year, but I realize some of you would never be happy with a big slice of roasted cauliflower for dinner, even if it had a garlicky topping with red pepper, capers, lemon, and olives. If you’re one of those people who can’t get that excited about roasted cauliflower, feel free to consider this a side dish. But cauliflower lovers like myself will happily devour this as a meatless main dish and call it dinner.  And I ate the leftovers cold out of the fridge the next day; it was that good! So for all you cauliflower lovers like myself check out Low-Carb and Keto Roasted Cauliflower for more tasty recipes like this one. 

This recipe was adapted from Melissa Roberts’ Roasted Cauliflower with Kalamata Vinaigrette that appeared in Gourmet Magazine. And there was certainly nothing wrong with that version of the recipe; my Greek friend Mary tried it and loved it. But the original photos were nothing to get excited about and when we decided to update them Jake and I got a little creative and added chopped red pepper and a few capers to the garlicky vinaigrette, which made it even more flavorful and definitely more colorful. 

The hardest part of the recipe might be slicing the cauliflower so it doesn’t fall apart, so buy the biggest cauliflower you can find. But even if your cauliflower ends up in pieces instead of slices, I promise you that this is really delicious!

What ingredients do you need for this recipe?

  • head cauliflower
  • olive oil
  • salt and fresh ground black pepper to taste
  • Minced Garlic (affiliate link)
  • fresh-squeezed lemon juice (I used my fresh-frozen lemon juice)
  • Kalamata olives (optional)
  • red bell pepper
  • Capers (affiliate link)

collage showing steps for making Roasted Cauliflower Slices with Red Pepper, Capers, Lemon, and Olives

How to make this recipe:

(Scroll down for complete printable recipe including nutritional information.)

  1. Cut a head of cauliflower into slices about 3/4 inches thick. I cut through the core of the cauliflower to keep the pieces intact, and then cut some of the core away afterwards.
  2. Lay the cauliflower slices in a single layer on a roasting pan. It’s important that the pan isn’t crowded. 
  3. Drizzle both sides of the cauliflower with olive oil and season liberally with salt and fresh ground black pepper.
  4. Roast cauliflower in a 450F/220C oven, cooking without turning for at least the first 15 minutes.
  5. While the cauliflower roasts, mash 1/2 tsp. Minced Garlic (affiliate link) with some salt. I used a mortar and pestle, but you can do this in a bowl with a fork.
  6. Put the garlic and salt into a bowl with lemon juice (I rinsed out the mortar and pestle with the lemon juice), then stir in olive oil, whisking until the vinaigrette is emulsified. 
  7. Then mix in the chopped olives, diced red pepper, and Capers (affiliate link), and let dressing sit so the flavors blend while the cauliflower finishes roasting.
  8. When the Roasted Cauliflower Slices are crisp and slightly browned, spoon the spicy garlic dressing mixture over the cauliflower pieces and serve hot.

Low-Carb Roasted Cauliflower Slices with Red Pepper, Capers, Lemon, and Olives found on KalynsKitchen.com

More Recipes for Cauliflower Fans:

The BEST Low-Carb Roasted Cauliflower Recipes ~ Kalyn’s Kitchen
Mashed Cauliflower Colcannon ~ Well Plated
Roasted Christmas Cauliflower with Red Bell Pepper, Green Olives, and Pine Nuts ~ Kalyn’s Kitchen
Turmeric Cauliflower Broccoli Chicken ~ Reluctant Entertainer
Roasted Cauliflower with Parmesan ~ Kalyn’s Kitchen

Low-Carb Roasted Cauliflower Slices with Red Pepper, Capers, Lemon, and Olives found on KalynsKitchen.com

Roasted Cauliflower Slices with Red Pepper, Capers, and Olives

Yield 4 servings
Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes

Cauliflower fans will enjoy these Low-Carb Roasted Cauliflower Slices with Red Pepper, Capers, and Olives for a meatless main dish or a side dish!


  • 1 large head cauliflower
  • 2 T olive oil
  • salt and fresh ground black pepper to taste
  • 1/2 tsp. minced garlic
  • pinch sea salt
  • 3 T fresh-squeezed lemon juice
  • 3 T extra-virgin olive oil
  • 1/4 cup finely chopped Kalamata olives (optional, see notes)
  • 1 red bell pepper, chopped small
  • 1 T capers


  1. Preheat oven to 450F/200C.
  2. Remove leaves from cauliflower, then use a large knife to cut the cauliflower into slices an even 3/4 inch thick, slicing through the core. Cut core section away from the slices and arrange cauliflower slices in a single layer on a baking sheet. (Don’t worry if some piece break off; they will still taste great!)
  3. Drizzle both sides of cauliflower with olive oil and season with salt and fresh ground black pepper. (I used a generous amount of pepper, but not too much salt.)
  4. Start cauliflower roasting while you make the vinaigrette, and let it roast 15 minutes without turning.
  5. While cauliflower roasts, mash garlic and sea salt in a mortar and pestle (or use a fork and a bowl), then rinse the garlic and salt mixture into a bowl with the lemon juice. Stir in the olive oil, whisking until the dressing is emulsified. Stir in chopped red peppers, capers and olives and let the vinaigrette ingredients blend while cauliflower continues cooking.
  6. After about 15 minutes, remove cauliflower from the oven and carefully turn cauliflower pieces with a large turner.
  7. Put back in oven and roast 10-15 minutes more, or until cauliflower is slightly crisp and nicely browned, and done to your liking.
  8. Serve hot, with the garlicky dressing mixture drizzled over cauliflower


You can use plain black olives if you prefer, or skip the olives completely.

This recipe adapted from a recipe by Melissa Roberts for Gourmet Magazine.

Nutrition Information:



Serving Size:


Amount Per Serving: Calories: 228Total Fat: 20gSaturated Fat: 3gUnsaturated Fat: 16gCholesterol: 0mgSodium: 314mgCarbohydrates: 12gFiber: 6gSugar: 6gProtein: 4g

Nutrition information is automatically calculated by the Recipe Plug-In I am using. I am not a nutritionist and cannot guarantee 100% accuracy, since many variables affect those calculations.

If you make this recipe I'd love to hear how it turns out. Leave a star rating or share on social media with the hashtag #KALYNSKITCHEN, thanks!

Low-Carb Diet / Low-Glycemic Diet / South Beach Diet Suggestions:
Roasted Cauliflower Slices with Red Pepper, Capers, and Olives are a great side dish or vegetarian main dish for any phase of the original South Beach Diet or any other type of low-carb or low-glycemic eating plan.

Find More Recipes Like This One:
Use Sheet Pan Meals or Cauliflower Recipes to find more recipes like this one. Use the Recipes by Diet Type photo index pages to find more recipes suitable for a specific eating plan. You might also like to Follow Kalyn’s Kitchen on Pinterest to see all the good recipes I’m sharing there.

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    39 Comments on “Roasted Cauliflower Slices with Red Pepper, Capers, and Olives”

  1. Long time reader, first time poster. Just had to say this was FANTASTIC! I made this the other night and couldn't stop eating it. I even loved it without the dressing. I will be making this again and again. Thanks so much for the receipe.

  2. A lot of cauliflower recipes can be bland – what a great idea to roast and dress with kalamata vinaigrette – such good flavors.

  3. Hi Kalyn,
    I just wanted to tell you how much I love your recipes! Youre site is such great inspiration. Keep up the good work.

  4. This is so unique and looks absolutely fantastic! I love kalamata olives and I bet it goes great with cauliflower!

  5. That looks amazing. And I love that you use more of the cauliflower (it looks like) with it. I adore kalamatas.

  6. I did mean to say "rinse." I mashed the garlic and salt together, then added the lemon juice and used the lemon juice to rinse the garlic out of the mortar and pestle. But if you mashed the garlic in a bowl that was big enough to make the dressing, you could skip that step.

  7. This sounds really delicious, I love roasted veggies and glad to have another way to prepare cauliflower.
    One little question: "then *rinse* the garlic and salt mixture into a bowl with the lemon juice."
    Rinse? Maybe whisk?
    Also, want you to know that I've been South Beachin' for about 6 weeks now and your website has been beyond amazing. It's all the kinds of food I like anyway, and the recipes are fantastic!

  8. ValerieAnne, I love the idea of eating this vinaigrette on eggplant of zucchini. Great idea!

  9. I think this dressing would be really good on zucchini and possibly eggplant. I'm not a big eggplant lover, which is why I would try it.

  10. I'm so glad people are liking this, because this recipe is amazing. I think I need to make it again soon.

    Eleanora, thanks so much. My wonderful brother Rand is the one who designs the headers. He's such a blessing to me, love him!!

  11. Love the new ♥ header and the garlic vinaigrette!! Ciao from a huge fan

    Eleonora xx

  12. This dish is definitely worth waiting for! I love cauliflower, especially roasted. Sounds delicious.

  13. Cauliflower is one of those vegetables that is so hard to get right. This recipe looks delicious and super savoury.

  14. I confess that I've tried cutting cauliflower like this with the intent to grill and they ended up all falling apart! Nice job, yours look much better 🙂

  15. i love roasted cauliflowers any which way I can get. Such a unique addition of garlic and kalamata olives, looks very delicious.

  16. You couldn't have put a more perfect topping on the cauliflower. I would happily eat olives all day, particularly kalamata ones. This would be a great topping for braised leeks, too.

  17. Oh Boy does that look good.I love olives -black, green, Greek you name it. I would never think of combining cauliflower with olives but it looks fabulous and definelty am going to try this recipe.

  18. Oh my god, that looks so good! I need to make that very soon — I even have everything (okay, except the cauliflower) 😉

  19. Some day I will learn to love cauliflower, I really will — so I'm bookmarking this recipe in anticipation. Love the kalamata vinaigrette; I'm going to try that on some roasted vegetables.

  20. Looks yummy! 🙂 ~Lanie