Greek Salad with Roasted Tomatoes (A Nutritionist’s Recipe)

by Alex Stewart | May 3, 2026 | 0 comments

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Why I Roast the Tomatoes First

I made this for friends last weekend. It was meant to be the supporting act next to stuffed aubergines, grilled chicken, warm flatbread and homemade tzatziki. Three people asked what I’d done differently.

The answer: I roasted the tomatoes for fifteen minutes before assembling. That’s it. That’s the whole upgrade.

I started doing this for the nutrition science (stick with me, I’ll explain in a sec), but honestly it’s the flavour change that makes people notice. Roasting concentrates the sweetness and gives you soft, almost-jammy tomatoes instead of the watery raw ones that tend to drown most Greek salads. The science is just a nice bonus.

The Lycopene Trick (Yes, Cooking Tomatoes Is Actually a Good Thing)

Most recipes will tell you to use the freshest, ripest tomatoes you can find. I’m telling you to put them in a hot oven first. Hear me out.

Cooking tomatoes increases the bioavailability of lycopene, the deep-red carotenoid that gives tomatoes their colour and is linked to a long list of health benefits, particularly for cardiovascular and skin health (1). The catch is, tomatoes lock most of their lycopene inside tough plant cell walls. When you eat them raw, your gut only manages to extract a small fraction of it. Heat changes that.

Here’s the cool bit. A study by Gärtner and colleagues (2) found that lycopene from cooked tomato paste was around 2.5 times more bioavailable than from raw tomatoes. Later research has shown the same pattern across different cooking methods and times (3). So when the raw food crowd tell you cooking destroys nutrients? Sometimes they’re right, sure. But sometimes (like here) heat actually does the opposite.

Fifteen to seventeen minutes won’t take you to peak lycopene levels, but it gets you a meaningful chunk of the way there while keeping the tomatoes intact for a salad. You want them softened with the skins just starting to blister, not collapsed into a sauce.

There’s a second trick happening too. Lycopene is fat-soluble, so it needs a bit of fat to be properly absorbed. Which means when you roast in olive oil and then dress the salad with even more olive oil? You’re stacking the absorption boost. Pretty clever, right?

(If you want a deeper dive on why Greek salad is a nutrition powerhouse beyond the tomatoes, I’ve broken down the rest of the ingredients here.)

What Else Makes This Different From a Standard Greek Salad

Roasting the tomatoes is the headline change, but there are a few smaller tweaks worth knowing about:

Red pepper instead of green. Green peppers are traditional, but they’re basically just unripe red peppers and faintly bitter. Red is the same vegetable left on the vine longer. Sweeter, higher in vitamin C, nicer to eat. Win win.
Croutons. Not traditional, I know. Strict greek salad recipes have no bread in the salad (you mop the dressing with it afterwards). But a bit of crunch in every bite is a real upgrade, trust me.
No mint. Some recipes throw mint in. I find it fights with the oregano for attention.
Soaked red onion. Ten minutes in cold water pulls out the harsh sulfur compounds without softening the crunch. Restaurants do this all the time, home cooks weirdly never do.
Two-stage oregano. Once in the dressing, once scattered on top. The dressing oregano flavours the oil; the scattered oregano stays bright and fragrant on the plate.

The dressing itself is brutally simple: extra virgin olive oil, red wine vinegar, dried oregano, salt, pepper. No mustard, no garlic, no honey. The whole point is to taste the tomatoes and the feta, not to drown them in seventeen other things.

Greek Salad with Roasted Tomatoes

Alex Stewart, AfN Registered Nutritionist

A Nutritionist's twist on the classic. Roasting the tomatoes concentrates their sweetness and boosts lycopene absorption, while croutons add the crunch.

Print Recipe

Prep Time 15

Cook Time 15

Course Salad

Cuisine Greek

Ingredients

4 large vine tomatoes quartered
1 tbsp olive oil for the tomatoes
1 red bell pepper sliced
1 cucumber chopped in to half moons
½ small red onion thinly sliced
200 g feta cheese block, not crumbled
100 g Kalamata olives if using
2 thick slices sourdough or country bread cubed
1 tbsp olive oil for the croutons
4 tbsp extra virgin olive oil for the dressing
2 tbsp red wine vinegar
1 tsp dried oregano in dressing
½ tsp dried oregano to finish
½ tsp sea salt
Pinch of freshly ground black pepper

Instructions

Roast the tomatoes. Heat the oven to 200°C (180°C fan / 400°F). Place the tomatoes on a lined tray, drizzle with 1 tbsp olive oil, season with a pinch of salt, and roast for 15 to 17 minutes until they soften and the skins start to blister. You want them holding their shape, not collapsed. This unlocks the lycopene and deepens the flavour.
Soak the red onion. While the tomatoes roast, put the sliced onion in a small bowl of cold water. Leave for 10 minutes, then drain and pat dry.
Make the croutons (or use shop bought). Toss the cubed bread with 1 tbsp olive oil and a pinch of salt. Spread on a tray and bake for 8 to 10 minutes until golden and crisp.
Prep the rest. Slice the pepper into strips and chop the cucumber into half moons. Add to a large serving bowl with the olives and the drained onion.
Whisk the dressing. In a small jug, whisk the extra virgin olive oil, red wine vinegar, 1 tsp oregano, the rest of the salt, and the pepper.
Build the salad. Add the slightly cooled roasted tomatoes (still warm is great, it lets the dressing emulsify a little when it hits) to the bowl. Pour over the dressing and toss gently.
Finish and serve. Chop feta in the cubes and chuck them on top. Scatter over the remaining ½ tsp oregano and the croutons just before serving so they stay crunchy.

Why these choices: Roasting the tomatoes is the key change. Heat breaks down the cell walls and makes the lycopene more bioavailable, plus the flavour deepens noticeably. Soaking red onion in cold water mellows the bite without losing the crunch.

Keyword greek salad, roasted tomatoes, lycopene

Frequently Asked Questions

Does cooking tomatoes destroy nutrients?

It depends on the nutrient. Cooking does reduce vitamin C levels in tomatoes by around 10 to 30 percent. But it dramatically increases lycopene bioavailability, often by two to three times. So overall, cooked tomatoes can end up being a better source of antioxidants than raw ones.

Is Greek salad healthy?

Yes, and I’ve actually written a whole post on the health benefits of Greek salad if you want the full breakdown. Short version: tomatoes, cucumber, peppers, olives and olive oil are a powerhouse combo that delivers carotenoids, vitamin C, vitamin K, monounsaturated fats and polyphenols. Feta brings protein and calcium. The one thing to keep an eye on is sodium (feta and olives are both salty), so if you’re watching blood pressure, keep portions moderate. I’ll be honest, I leave out olives completely, I just can’t hack the taste!

Why do you soak the red onion in water?

Raw red onion contains sulfur compounds that taste sharp and overpowering and (let’s be honest) can linger on the breath for hours. Soaking thinly sliced onion in cold water for 10 minutes draws those compounds out without softening the texture. You’re left with onion that still has crunch and a bit of pungency, but doesn’t dominate everything else in the bowl. Total game changer.

Can I make Greek salad ahead?

Partially, yes. You can roast the tomatoes, prep the veg, soak the onion and make the dressing several hours in advance and store everything separately in the fridge. Just assemble and dress right before serving, and add the croutons last so they stay crunchy. Once it’s dressed, eat within an hour. Any longer and the salt starts pulling water out of the tomatoes and cucumber and the croutons go sad.