Roasted Cauliflower Salad Recipe — Easy, Healthy & Ready in 25 Minutes

This roasted cauliflower salad is a warm, colourful side dish made with cauliflower, sweet peppers, red onion and garlic, all roasted together in under 20 minutes. It's light, healthy, and packed with golden caramelised edges and fresh parsley on top.

The vegetables for this Roasted Cauliflower Salad go into one tray, the oven does the hard work, and 20 minutes later you have a plate full of caramelised cauliflower, sweet roasted peppers and softened red onion. The flavours are honest and simple — olive oil, garlic, a good crack of rainbow pepper, and a handful of fresh parsley to finish. It works as a side, as a light lunch, or as part of a bigger spread, and the leftovers taste just as good the next day straight from the fridge.

Ingredients for Roasted Cauliflower Salad with Peppers and Red Onion

Here is what you need to make this easy roasted cauliflower side dish:

• Cauliflower — the base of the salad. Roasting brings out a nutty, slightly sweet flavour and gives you those lovely golden edges.
• Sweet peppers — I use two different colours for a brighter plate. They turn soft and jammy in the oven and add natural sweetness.
• Red onion — cut into wedges so it holds its shape while roasting. It mellows out and adds a gentle sharpness to the salad.
• Garlic cloves — minced garlic coats the vegetables and gives the whole tray a warm, savoury aroma as it roasts.
• Olive oil — extra virgin is what I reach for. It helps the vegetables caramelise properly and carries the flavour of the garlic.
• Sea salt — seasons the vegetables evenly and draws out their natural sweetness during roasting.
• Rainbow pepper — freshly cracked, it adds a soft heat and a pretty speckle across the finished salad.
• Fresh parsley — flat-leaf parsley, chopped and scattered at the end. It lifts the whole dish and adds a clean, green finish.

How to Make Roasted Cauliflower Salad

How to Serve and Store This Roasted Vegetable Salad

I like serving this Roasted Cauliflower Salad warm, straight from the oven, when the peppers are still soft and the cauliflower has that toasted edge. It pairs well with grilled chicken, baked fish, or a piece of crusty bread and some hummus for a light vegetarian meal. You can also spoon it over cooked grains like couscous, quinoa or bulgur for something more filling, or add a handful of feta and olives to turn it into a Mediterranean-style plate.

For storage, let the salad cool to room temperature, then keep it in an airtight container in the fridge for up to three days. It's delicious cold from the fridge the next day, but if you prefer it warm, a quick 5 minutes in a hot oven or a minute in the microwave brings it back to life. I wouldn't recommend freezing it — the cauliflower and peppers lose their texture once thawed.

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Tips and Notes for the Best Roasted Cauliflower Salad

• Cut the cauliflower into even-sized florets. This is the single biggest thing that affects how the salad turns out. If the pieces are different sizes, the small ones burn while the large ones stay raw in the middle. Aim for bite-sized florets about 3-4 cm across. Give them a quick check once they're on the tray and break down any that look oversized.
• Preheat the oven properly. A hot oven is what gives you those crispy, golden edges on the cauliflower. Don't be tempted to put the tray in before the oven has reached 200°C, or the vegetables will release water and turn soft instead of roasting. I usually turn the oven on first thing, then prep the vegetables while it heats up. By the time you're done chopping, the oven is ready.
• Use good olive oil. Since there are only a handful of ingredients, the quality of each one matters. A decent extra virgin olive oil adds flavour as well as helping the vegetables brown. It doesn't need to be your most expensive bottle, but avoid very cheap blended oils — they tend to be flavourless and the whole dish suffers for it.
• Cut the peppers and onion thicker than you think. Peppers and onion cook faster than cauliflower, so if you slice them too thin they'll go limp and overcooked by the time the cauliflower is ready. I cut the peppers into strips about 1.5 cm wide and the onion into proper wedges, not thin slices. They end up soft and sweet rather than mushy.
• Stir the tray halfway through. Around the 7-8 minute mark, give everything a good stir. This makes sure all sides of the vegetables get a chance to touch the hot tray, which is where the caramelisation happens. It also stops any bits from sticking or catching. Set a timer if you're likely to forget — it's easy to lose track when you're doing something else.
• Season at the right moment. Salt before roasting so it draws out the natural sweetness and seasons the vegetables all the way through. Save the fresh parsley and an extra crack of pepper for after roasting — parsley added before will just wilt and lose its colour. A small drizzle of olive oil at the end is a nice touch too if the salad looks dry.

FAQ About Roasted Cauliflower Salad

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Roasted Cauliflower Salad Recipe

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Roasted cauliflower salad with sweet peppers, red onion and garlic — a warm, colourful side dish ready in 25 minutes. Light, healthy, and packed with golden caramelised edges and fresh parsley.

Prep Time 5 minutes

Cook Time 20 minutes

Total Time 25 minutes

Ingredients

• 1 medium cauliflower (about 600 g / 1.3 lb)
• 2 sweet peppers, different colours (about 300 g / 10 oz total)
• 1 red onion (about 150 g / 5 oz)
• 3-4 garlic cloves
• 2 tablespoon olive oil
• Sea salt, to taste
• Freshly cracked rainbow pepper, to taste
• Fresh parsley, for garnish (small handful)

Instructions

1. Preheat your oven to 200°C (180°C fan / 400°F / gas mark 6). Line a large roasting tray with baking parchment or leave it bare if it's non-stick.
2. Cut the cauliflower into bite-sized florets, roughly 3-4 cm across. Slice the red onion into wedges, keeping the root end intact so the layers hold together. Cut the sweet peppers into strips about 1.5 cm wide, and mince the garlic cloves finely.
3. Place all the prepared vegetables on the roasting tray. Mix the minced garlic with the olive oil in a small bowl, then drizzle over the vegetables. Season with sea salt and freshly cracked rainbow pepper, and toss everything well with your hands so each piece is evenly coated.
4. Spread the vegetables out in a single layer with a little space between the pieces. Roast for about 15-20 minutes, stirring once halfway through, until the vegetables are golden, slightly caramelised at the edges, and still have a gentle bite.
5. Transfer the roasted vegetables to a serving bowl and mix gently. Chop the fresh parsley and scatter generously over the top. Serve warm, at room temperature, or cold from the fridge the next day.

Notes

For the best texture, use a large roasting tray and avoid overcrowding the vegetables. Cauliflower needs space to caramelise properly — if the florets are touching, they steam rather than roast and lose that lovely golden edge.

If you want extra crispness, turn the oven up to 220°C (200°C fan) for the last 3-4 minutes of roasting. Keep an eye on the garlic so it doesn't burn, and stir once more if things are colouring unevenly.

This salad works beautifully as a meal prep option. Roast a double batch at the weekend and store it in the fridge — it keeps well for three days and makes a quick lunch with some hummus and flatbread, or tossed through grains.

Feel free to swap the rainbow pepper for regular black pepper if that's what you have. A pinch of smoked paprika or dried chilli flakes is also lovely if you want a little warmth and smoky depth.

To turn this into a more substantial meal, add crumbled feta, a handful of chickpeas, toasted pine nuts, or a squeeze of lemon juice at the end. A drizzle of tahini dressing also works brilliantly and makes it feel more indulgent.