Mediterranean Baked Sablefish Recipe with Tomatoes & Olives

Mediterranean Baked Sablefish: An Easy Oven Dinner

Baked sablefish (also called black cod) turns tender and buttery alongside tomatoes, Kalamata olives, lemon and herbs. This Mediterranean-inspired oven recipe is designed for four individual fillet portions and includes a simple lemon-herb couscous side. Unlike a stovetop tomato stew, the fish finishes in the oven with its sauce so you can serve an entire meal from one baking dish and a small saucepan.

Serves: 4. Prep: about 15 minutes. Cooking: about 20–25 minutes depending on fillet thickness. Oven: 375°F (190°C). Safe internal fish temperature: 145°F (63°C).

Ingredients for Mediterranean Black Cod

For the sablefish and sauce

• 4 sablefish fillet portions, about 6 oz each (1½ lb total), thawed if frozen
• 1 tablespoon olive oil for the fish, plus 1 tablespoon for the sauce
• ½ medium red onion, thinly sliced
• 2 garlic cloves, minced
• 1 can (14–15 oz) diced tomatoes with their juices
• ⅓ cup pitted Kalamata olives, halved
• 1 tablespoon drained capers
• 2 sprigs fresh thyme or ½ teaspoon dried thyme
• ½ teaspoon dried oregano
• Finely grated zest of ½ lemon, plus lemon wedges for serving
• Freshly ground black pepper; salt only after tasting the olive-and-caper sauce
• 2 tablespoons chopped flat-leaf parsley for serving

Optional lemon-herb couscous

• 1 cup dry pearl couscous
• ¼ cup chopped sun-dried tomatoes
• ¼ cup crumbled feta
• 2 tablespoons toasted pine nuts
• 1 tablespoon lemon juice
• 1 tablespoon olive oil
• Chopped parsley or dill to taste

How to Bake Sablefish with Tomatoes and Olives

Step 1: Heat the oven and prepare the fish

Preheat the oven to 375°F. Lightly oil a baking dish large enough to hold four fillets in one layer, or use an oven-safe skillet. Pat the fish dry with paper towels and check for remaining pin bones. Keep the fish chilled while you prepare the sauce. For skin-on portions, the skin can remain underneath the fish during baking.

Step 2: Soften the onion and garlic

Warm 1 tablespoon olive oil in a skillet over medium heat. Cook the red onion for about 4–5 minutes until softened. Add garlic and stir for 30 seconds, just until aromatic. This short stovetop step prevents the fish from spending too long in the oven while raw onions soften.

Step 3: Start the tomato-olive sauce

Stir in the diced tomatoes and juices, Kalamata olives, capers, thyme and oregano. Simmer gently for 4–5 minutes. The mixture should remain juicy enough to spoon around the fish. If it reduces too much, add a tablespoon or two of water. Taste before adding salt: capers and olives already bring plenty of seasoning.

Step 4: Arrange the fish in the baking dish

Transfer the sauce to the baking dish if you are not using an oven-safe skillet. Nestle the four fillets into the warm mixture without stacking them. Brush the exposed surface lightly with the remaining tablespoon of olive oil and add black pepper and lemon zest. Spoon sauce around the fillets, leaving some of each top exposed.

Step 5: Bake until the fish is cooked

Bake uncovered on the middle rack. Begin checking the thickest part after about 10–12 minutes. Actual time depends on thickness, starting temperature and your oven; thicker portions may need longer. Cook each piece to 145°F (63°C) on an instant-read thermometer. Remove finished thinner pieces promptly rather than leaving them to wait for larger ones.

Step 6: Finish with lemon and herbs

Remove the thyme sprigs. Sprinkle with parsley and offer lemon wedges at the table. Spoon the warm tomatoes and olives over or alongside the fish, taking care not to break up the tender fillets. Serve immediately with couscous, crusty bread or roasted vegetables.

Easy Lemon-Herb Couscous for Serving

Cook the pearl couscous according to package instructions while the fish bakes. Drain if necessary, then fold in sun-dried tomatoes, crumbled feta, toasted pine nuts, lemon juice, olive oil and herbs. Taste before salting because feta and sun-dried tomatoes can already be salty. For a dairy-free side, omit feta. If you prefer traditional small couscous instead of pearl couscous, follow its package's different water ratio and cooking instructions.

Why Sablefish Works in a Mediterranean Oven Recipe

Sablefish has a naturally rich texture and delicate flakes. It is sold under the market name black cod but is a distinct species from ordinary cod. Its richness pairs well with bright tomatoes and lemon, while briny Kalamata olives cut through the buttery finish. The trick is to cook the sauce first, then add the fish only for the final baking stage.

This dish differs from our Veracruz-style sablefish recipe: Veracruz is a gently simmered stovetop dish with green olives and optional jalapeño, while this recipe is an oven-baked Mediterranean dinner with Kalamata olives, thyme and lemon-herb couscous.

Five Mistakes to Avoid When Baking Black Cod

• Putting raw onion and fish in the oven together: the onion may need more time than the fish. Soften it before baking.
• Overcrowding the baking dish: fillets stacked on top of each other cook unevenly. Use one layer.
• Boiling the sauce dry: tomatoes need enough juices to surround the fish without scorching. Add a splash of water if needed.
• Salting heavily before tasting: Kalamata olives and capers already contribute salt.
• Relying on a fixed cooking time: sablefish thickness varies; use a thermometer to confirm 145°F.

Variations and Ingredient Swaps

Cherry tomatoes instead of canned

Replace the canned tomatoes with about 2 cups of halved cherry tomatoes and a splash of water. Give them time to soften in the skillet before baking the fish.

Add vegetables

Thin strips of bell pepper or a handful of spinach fit the Mediterranean flavor profile. Sauté peppers with the onion; fold spinach into the hot sauce just before adding the fish. Do not pile a large amount of uncooked vegetables on top of the fillets.

Make it without capers

Omit capers if unavailable and add an extra squeeze of lemon at the end for brightness. The Kalamata olives still provide a salty, savory contrast.

Serve without couscous

Roasted potatoes, white beans, sautéed greens or crusty bread are practical alternatives. Cook substantial sides separately so the fish does not sit in the oven waiting for them.

Fresh or Frozen Sablefish: What to Know

Fresh and frozen sablefish fillets can both work well for this recipe. Read the product listing for cut, skin and weight; thaw frozen seafood according to the package instructions in the refrigerator. Follow special instructions on vacuum-sealed packages, including removing the fish from reduced-oxygen packaging before thawing if directed. Never thaw seafood on the countertop. The FDA seafood handling guide advises keeping raw seafood cold and cooking finfish to 145°F.

Frequently Asked Questions

Can I use sablefish steaks instead of fillets?

Yes, but steaks are typically bone-in and may differ in thickness. Plan for bones at the table and adjust cooking time based on the thickest part. Fillets are easier to serve as individual portions.

Should I cover the dish with foil?

This recipe bakes uncovered, which lets some moisture evaporate while the tomatoes gently roast. If the surface begins to dry before the fish reaches temperature, spoon some sauce over it or loosely cover the dish for the remaining time.

Does black cod taste like Atlantic cod?

Not exactly. Sablefish, often marketed as black cod, is generally richer and more buttery than lean Atlantic or Pacific cod. It also flakes gently, so handle cooked portions with a wide spatula.

Can I make the sauce ahead of time?

Yes. Prepare and cool the tomato-olive sauce promptly, refrigerate it, then reheat until hot before adding the fish. For best texture, bake sablefish immediately before serving.

What temperature should baked sablefish reach?

Use a food thermometer and cook to 145°F (63°C) at the thickest point. Time estimates alone are not a reliable safety test.

Shop Black Cod for This Recipe

Start with sablefish (black cod) fillets for easy individual servings; check the current pack weight and preparation details before buying. Browse the sablefish collection for other cuts and formats. For a different preparation, see our miso-marinated black cod or baked sablefish with soy, lemon and ginger.