Cauliflower Red Onion Recipe Vegan Delight for Easy Meals

Updated On: October 7, 2025

Cauliflower and red onion combine beautifully in this vibrant vegan recipe that’s as nutritious as it is delicious. Whether you’re a seasoned plant-based eater or simply looking to add more wholesome veggies to your meals, this dish offers a perfect balance of flavors and textures.

The natural sweetness of roasted red onions complements the mild, nutty taste of cauliflower, creating a mouthwatering harmony that’s sure to please your palate.

Not only is this recipe simple and quick to prepare, but it also highlights the versatility of these two ingredients in a way that’s both satisfying and nourishing. Perfect as a side dish or a main course when paired with grains or legumes, this cauliflower red onion recipe is ideal for anyone seeking a wholesome, vegan-friendly meal.

Let’s dive into the details so you can easily whip up this tasty, colorful, and healthy dish!

Why You’ll Love This Recipe

Flavorful and vibrant: The caramelization of red onions adds a subtle sweetness that perfectly balances the earthy cauliflower. Roasting enhances the natural flavors, making every bite delightful.

Easy and quick to prepare: With just a handful of ingredients and minimal prep time, this recipe is perfect for busy weeknights or casual dinners.

Nutritious and vegan: Packed with fiber, vitamins, and antioxidants, this dish supports a healthy lifestyle without compromising on taste.

Plus, it’s versatile enough to be served as a hearty side or a satisfying main!

Ingredients

  • 1 medium head of cauliflower, cut into florets
  • 1 large red onion, thinly sliced
  • 3 tablespoons olive oil
  • 2 cloves garlic, minced
  • 1 teaspoon smoked paprika
  • 1 teaspoon ground cumin
  • Salt and freshly ground black pepper, to taste
  • 1 tablespoon fresh lemon juice
  • 2 tablespoons fresh parsley, chopped (optional garnish)
  • 1/4 teaspoon red pepper flakes (optional for heat)

Equipment

  • Baking sheet
  • Mixing bowl
  • Chef’s knife
  • Cutting board
  • Measuring spoons
  • Spatula or wooden spoon
  • Oven mitts

Instructions

  1. Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper or lightly grease it.
  2. Prepare the vegetables: Wash the cauliflower and cut it into bite-sized florets. Peel and thinly slice the red onion into rings or half-rings depending on your preference.
  3. In a large mixing bowl, combine the cauliflower florets and sliced red onion. Add the minced garlic, olive oil, smoked paprika, ground cumin, salt, and pepper. Toss everything well until all pieces are coated evenly with the oil and spices.
  4. Spread the mixture evenly on the prepared baking sheet in a single layer to ensure even roasting.
  5. Roast in the oven for 25-30 minutes, turning halfway through to promote even browning. The cauliflower should be tender and slightly crisp on the edges, and the onions should be caramelized.
  6. Remove from the oven and immediately drizzle with fresh lemon juice. Toss gently to combine.
  7. Garnish with chopped parsley and sprinkle red pepper flakes if you like a bit of heat.
  8. Serve warm as a side dish or over grains for a complete vegan meal.

Tips & Variations

“For an extra layer of flavor, try adding a sprinkle of nutritional yeast after roasting—it gives a cheesy, umami boost while keeping it vegan!”

  • Change up the spices: Experiment with curry powder, turmeric, or za’atar for different flavor profiles.
  • Add nuts or seeds: Toasted pine nuts or pumpkin seeds add crunch and nutrition.
  • Include other veggies: Bell peppers or cherry tomatoes roast beautifully alongside cauliflower and onions.
  • Make it a salad: Let the roasted veggies cool and toss with fresh greens and a tahini dressing for a hearty salad.
  • Use balsamic vinegar: A drizzle of balsamic vinegar just before serving intensifies the sweetness of the onions.

Nutrition Facts

Nutrient Amount per Serving % Daily Value*
Calories 150 7%
Carbohydrates 15g 5%
Dietary Fiber 5g 20%
Protein 4g 8%
Fat 8g 12%
Vitamin C 70mg 78%
Vitamin K 30mcg 25%
Iron 2mg 11%

*Percent Daily Values are based on a 2,000 calorie diet.

Serving Suggestions

This roasted cauliflower and red onion dish shines when served alongside a variety of mains. For a wholesome vegan meal, pair it with quinoa, brown rice, or couscous, adding a drizzle of tahini or a squeeze of extra lemon for brightness.

It also works wonderfully as a topping for toasted flatbreads or wraps, combined with fresh greens and vegan yogurt sauce. For a protein boost, serve alongside lentils, chickpeas, or your favorite plant-based protein option.

Looking for inspiration? Check out these delicious recipes that complement this dish perfectly:

Conclusion

This vegan cauliflower and red onion recipe is a testament to how simple ingredients can come together to create something truly special. The roasting process enhances their natural sweetness and texture, delivering a dish that’s both comforting and full of flavor.

Whether you’re looking to add more plant-based meals to your rotation or want a quick, healthy side, this recipe fits the bill.

With its ease of preparation, customizable spice profile, and nutritional benefits, this recipe is sure to become a favorite in your kitchen. Plus, the vibrant colors and appetizing aroma make it a wonderful dish to share with family and friends.

Don’t forget to explore the other delicious recipes linked above to expand your vegan cooking repertoire!

📖 Recipe Card: Cauliflower Red Onion Vegan Stir-Fry

Description: A simple and flavorful vegan dish featuring roasted cauliflower and caramelized red onions. Perfect as a side or a light main course.

Prep Time: PT10M
Cook Time: PT25M
Total Time: PT35M

Servings: 4 servings

Ingredients

  • 1 medium head cauliflower, cut into florets
  • 1 large red onion, thinly sliced
  • 2 tablespoons olive oil
  • 2 cloves garlic, minced
  • 1 teaspoon smoked paprika
  • 1/2 teaspoon ground cumin
  • Salt to taste
  • Black pepper to taste
  • 1 tablespoon lemon juice
  • 2 tablespoons fresh parsley, chopped

Instructions

  1. Preheat oven to 425°F (220°C).
  2. Toss cauliflower florets with 1 tablespoon olive oil, smoked paprika, cumin, salt, and pepper.
  3. Spread cauliflower on a baking sheet and roast for 20 minutes, stirring halfway.
  4. While cauliflower roasts, heat remaining olive oil in a pan over medium heat.
  5. Add sliced red onion and cook until caramelized, about 8 minutes.
  6. Add minced garlic and cook for 1 minute more.
  7. Combine roasted cauliflower and caramelized onions in a bowl.
  8. Drizzle with lemon juice and sprinkle with fresh parsley before serving.

Nutrition: Calories: 150 kcal | Protein: 4 g | Fat: 8 g | Carbs: 18 g

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Photo of author

Marta K

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