Baked Cod with Tomato-Olive Ragout and Roasted Asparagus

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

Delicate cod fillets baked under a vibrant tomato and olive ragout, paired with crisp roasted asparagus for a light Whole30 meal. This Mediterranean-inspired seafood recipe (whole30, gluten free), ready in about 40 minutes, pairs cod fillets, cherry tomatoes, kalamata olives for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 310 calories and feeds 4, so it slots cleanly into a Whole30 week and pairs well with roasted sweet potato or a simple olive-oil salad. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 25 min Serves 4 Mediterranean cuisine 310 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat the oven to 400°F. Arrange 1 lb trimmed asparagus spears on a baking sheet lined with parchment. Drizzle with 1 tbsp olive oil, sprinkle 1/2 tsp salt and 1/4 tsp black pepper, and roast for 12-15 minutes until tender and lightly browned.
  2. Step 2: In a medium skillet, heat 2 tbsp olive oil over medium heat. Add 1/3 cup finely chopped red onion and 4 minced garlic cloves, cooking for 3-4 minutes until softened and fragrant.
  3. Step 3: Add 1 1/2 cups quartered cherry tomatoes, 1/2 cup halved kalamata olives, 1/4 tsp crushed red pepper flakes (if using), and 1 tsp salt. Simmer gently for 8-10 minutes until tomatoes break down into a chunky sauce.
  4. Step 4: Stir in 1/4 cup chopped fresh basil and 2 tbsp lemon juice, then remove from heat.
  5. Step 5: Place 4 cod fillets in a lightly oiled baking dish. Season each with 1/2 tsp salt and 1/4 tsp black pepper. Spoon the tomato-olive ragout evenly over the cod.
  6. Step 6: Bake the cod with ragout in the oven for 12-15 minutes until the fish is opaque and flakes easily with a fork. Serve immediately with the roasted asparagus.

Frequently asked questions

How long does Baked Cod with Tomato-Olive Ragout and Roasted Asparagus take to make?

Total time is about 40 minutes (15 min prep + 25 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Baked Cod with Tomato-Olive Ragout and Roasted Asparagus?

Refrigerate in a covered airtight container for up to 3–4 days (FDA FoodKeeper guideline for cooked fish). Store any fresh salsa or citrus-based garnish in a separate container — it keeps for up to 2 days. Freeze cooked fish (without fresh garnishes) for up to 3 months; thaw overnight in the fridge and reheat gently at 275°F until just warmed through to preserve texture.

Can I substitute ingredients in Baked Cod with Tomato-Olive Ragout and Roasted Asparagus?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Baked Cod with Tomato-Olive Ragout and Roasted Asparagus for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Baked Cod with Tomato-Olive Ragout and Roasted Asparagus whole30?

Yes — this recipe is tagged whole30, gluten free, dairy free, paleo, low carb based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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