Spicy Tomato Baked Sea Bass
Want sea bass with a bit more going on than lemon and herbs?
This one bakes in a rich tomato and garlic sauce with chilli, olives, capers, and plenty of flavour around every fillet.
What makes baked sea bass really good is having enough sauce to spoon over everything once it comes out of the oven.
The fish stays tender while the tomato base cooks down around it, picking up garlic, chilli, and all those salty little bits from the olives and capers.
The tomatoes soften properly in the oven, so the sauce ends up rich rather than watery.
Then the lemon goes over at the end and gives the whole tray a bit of freshness.
It works with rice, potatoes, or crusty bread, depending on what you’re in the mood for.
Either way, you’ll want something there to catch the sauce.
Why This One Works So Well
- The fish stays juicy instead of drying out.
- The tomato sauce cooks around the sea bass, so it takes on plenty of flavour.
- Whole olives and capers give the sauce a salty punch.
- Roasted tomatoes add sweetness without making the sauce sugary.
- Lemon cuts through everything at the end.
- It looks impressive but is actually very straightforward.
What You’ll Need
For the Sea Bass
- 4 sea bass fillets
- 1 tablespoon olive oil
- 1 teaspoon smoked paprika
- 1/2 teaspoon garlic powder
- 1/2 teaspoon dried oregano
- 1/2 teaspoon salt
- 1/2 teaspoon black pepper
- 1/2 teaspoon red chilli flakes
For the Tomato Garlic Sauce
- 2 tablespoons olive oil
- 1 small onion, finely chopped
- 4 garlic cloves, finely chopped
- 1 tablespoon tomato purée
- 1 x 400g tin chopped tomatoes
- 250g cherry tomatoes
- 1 teaspoon dried oregano
- 1/2 teaspoon smoked paprika
- 1/2 teaspoon red chilli flakes
- 1/2 teaspoon black pepper
- Salt, to taste
- 80ml water
To Finish
- 100g Kalamata olives
- 2 tablespoons capers, drained
- 1 lemon, thinly sliced or cut into wedges
- Small handful fresh parsley, roughly chopped
- Extra chilli flakes, if you want more heat
How to Make It
- Heat the oven to 200°C fan / 220°C / 425°F.
- Season the fish.
Pat the sea bass fillets dry and rub them with the olive oil, paprika, garlic powder, oregano, salt, pepper and chilli flakes. - Start the sauce.
Heat the olive oil in a large frying pan over medium heat. - Cook the onion.
Add the onion and cook for around 5 minutes until soft. - Add the garlic.
Stir in the chopped garlic and cook for about 30 seconds. - Cook out the tomato purée.
Add it to the pan and stir for 1 minute. - Build the sauce.
Add the chopped tomatoes, cherry tomatoes, oregano, paprika, chilli flakes, black pepper and water. - Let it reduce.
Simmer for around 10 minutes, stirring occasionally. - Check the sauce.
It should be thick enough to sit around the fish rather than run all over the pan. - Transfer to a baking dish.
Spoon the sauce into a large ovenproof dish. - Add the sea bass.
Lay the fillets into the sauce with a little space between them. - Add the olives and capers.
Scatter them around the fish and over the sauce. - Add the lemon.
Tuck a few thin slices around the dish. - Bake for 12 to 15 minutes.
The fish should be opaque and flake easily when pressed with a fork. - Finish with parsley.
Scatter over a generous handful while everything is still hot. - Add more lemon at the table.
A squeeze over the fish right before eating makes a big difference.
Keep the Sauce Thick
This is the one thing I would not rush.
If the sauce goes into the oven too watery, the fish releases more moisture and you end up with something closer to tomato broth.
You want the base thick first.
The tomatoes should already be softened and the sauce should cling to the spoon.
Then it can loosen slightly in the oven without becoming thin.
Don’t Overcook the Sea Bass
Sea bass cooks quickly.
Very quickly.
Once the centre turns opaque and the flesh flakes apart easily, take it out.
There is no benefit to giving it another 10 minutes “just to be sure.”
That is usually how fish goes from soft and juicy to dry.
Why the Olives and Capers Matter
The tomato sauce is rich and naturally a little sweet once it cooks down.
That needs something salty and sharp beside it.
The olives bring the deeper briny flavour.
The capers are sharper and more punchy.
Together they make the sauce taste much more interesting than plain tomato and garlic.
A Note on the Chilli
You can make this as hot as you like.
For moderate heat, stick with the chilli flakes in the recipe.
For more heat, add fresh sliced red chilli to the sauce as well.
If you are feeding people who prefer things milder, halve the chilli and put extra flakes on the table.
What to Serve With It
Anything that can catch the sauce is going to work.
Try:
- Crusty bread
- Garlic bread
- Lemon rice
- Roasted potatoes
- Couscous
- Buttered orzo
- Steamed greens
- Simple salad
Bread is probably my favourite because you can drag it straight through the tomato sauce.
Can I Use Another Fish?
Yes.
Cod works well.
Haddock works too.
Halibut is great if you want something firmer.
Just keep an eye on the thickness of the fillets because cooking time will change slightly.
Can I Make the Sauce Ahead?
Definitely.
Make the tomato sauce a day or two ahead and keep it in the fridge.
When you are ready to cook, warm it first, transfer it to the baking dish and add the fish.
That actually makes this a very easy dinner for busy evenings.
Leftovers
Keep leftovers covered in the fridge for up to 2 days.
Warm them gently.
A low oven works well.
You can use the microwave too, but do it in short bursts so the sea bass does not become rubbery.
Final Thought
The sea bass is soft and flaky, but the sauce is what really carries the plate.
You get sweet roasted tomato, garlic, salty olives, little bursts of caper and enough chilli to wake everything up.
Then the lemon cuts through at the end and the parsley keeps it fresh.
Serve it with something you can drag through the bottom of the dish because leaving that sauce behind would be criminal.
