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Donostia-Style Cod with Piquillo Peppers

Name: Donostia-Style Cod with Piquillo Peppers
Prep time: 15 min
Cook time: 50 min
Total time: 65 min
Yield: 4 servings
Cuisine: Spanish, Basque
Ingredients: 4 desalted salt cod loin portions, about 6 ounces (170 g) each, skin on; 2 cans piquillo peppers from Lodosa, about 7 to 8 ounces (200 to 225 g) each, drained and thinly sliced; 1 medium yellow onion, thinly sliced; 6 garlic cloves, thinly sliced and divided; 3/4 cup (180 ml) extra-virgin olive oil, divided; 1 large dried guindilla chile, left whole, or 1 small whole dried red chile; 1/4 cup (60 ml) cider vinegar; 1/4 cup (60 ml) fish stock

Tender salt cod served with slow-cooked piquillo peppers and a glossy garlic, cider, and fish-stock sauce.

Prep15 min

Cook50 min

Total1 hr 5 min

Serves4 servings

Jump to Recipe

This Donostia-style cod combines tender salt cod with sweet piquillo peppers, slowly softened onion, and garlic-infused olive oil. The fish is gently baked so it stays moist while releasing gelatin that helps give the sauce body.

Cider vinegar and fish stock brighten the pepper and cod cooking juices, creating a savory sauce with a light emulsion rather than a heavy cream or flour base. The result is a colorful Spanish seafood main course suited to a relaxed dinner or a special meal.

Why You’ll Love This Recipe

Slow-cooked piquillo peppers and onion provide a sweet, savory contrast to the salt cod.
Gentle oven cooking keeps the thick cod portions moist and easy to serve whole.
The sauce gains body naturally from the cod juices and olive oil without flour, cream, or eggs.
Cider vinegar adds enough acidity to balance the richness of the fish and oil.
The pepper mixture can be prepared ahead, leaving only the cod and sauce to finish before serving.

Ingredient Notes

Desalted salt cod

Use thick loin or collar portions with the skin attached. Salt cod has a firmer texture and deeper savory flavor than fresh cod, and its skin releases useful gelatin during cooking.

Piquillo peppers from Lodosa

These small Spanish peppers are peeled and packed after roasting. They are sweet, tender, and mildly smoky; drain them before slicing so the onion-pepper mixture can concentrate properly.

Cider vinegar

Cider vinegar supplies a rounded acidity that complements the peppers without overpowering the cod. Add it with the stock at the end so its flavor stays lively.

Fish stock

A mild homemade fish stock gives the sauce depth without making it overly salty. When using packaged stock, choose a low-sodium product and check the ingredient label for any dietary concerns.

Expert Tips

Keep the onion and peppers over low heat so they soften and sweeten without scorching or becoming crisp.
Dry the cod well before baking to reduce splattering and prevent excess water from thinning the sauce.
Use a snug baking dish so the olive oil and gelatin-rich juices remain concentrated around the fish.
Fry the garlic only until pale golden; dark garlic turns bitter and can dominate the finished sauce.
Whisk the sauce while the liquids are warm rather than boiling, because excessive heat can make the emulsion separate.
Avoid stirring or flipping the cod unnecessarily, since desalted loin portions can break apart once cooked.

Serving Suggestions

Serve the cod over the piquillo pepper and onion mixture with plenty of sauce, accompanied by boiled baby potatoes, roasted potatoes, or a simple green salad.

For a Basque-inspired meal, add sautéed seasonal greens and pour dry cider or a crisp white wine alongside.

Storage and Reheating

Refrigerate leftovers in an airtight container within 2 hours and use them within 2 days. Reheat the cod, peppers, and sauce together very gently in a covered skillet over low heat until hot, avoiding a boil so the fish does not toughen and the sauce is less likely to separate. Freezing is not recommended because the cod can become dry and the emulsion may break.

Frequently Asked Questions

Can I use fresh cod instead of desalted salt cod?

Yes. Use thick skin-on cod portions and season them lightly, but expect a milder flavor and slightly less gelatin in the pan juices.

What can I substitute for piquillo peppers?

Well-drained jarred roasted red peppers are the closest widely available US substitute. They may be larger and less delicate, so slice them thinly and cook them slowly with the onion.

Why did the sauce not emulsify?

The mixture may have been too hot, too watery, or whisked too briefly. Let it cool slightly, then whisk steadily while adding the oily drippings gradually.

Can the pepper mixture be made ahead?

Yes. Cook and drain the peppers and onion up to 2 days ahead, refrigerate them with their reserved drippings, and rewarm gently before finishing the cod and sauce.

CuisineSpanish, Basque CourseMain Course Yield4 servings NutritionApprox. 390 calories per serving

Ingredients

4 desalted salt cod loin portions, about 6 ounces (170 g) each, skin on
2 cans piquillo peppers from Lodosa, about 7 to 8 ounces (200 to 225 g) each, drained and thinly sliced
1 medium yellow onion, thinly sliced
6 garlic cloves, thinly sliced and divided
3/4 cup (180 ml) extra-virgin olive oil, divided
1 large dried guindilla chile, left whole, or 1 small whole dried red chile
1/4 cup (60 ml) cider vinegar
1/4 cup (60 ml) fish stock

Instructions

Heat the oven to 320°F (160°C) and pat the desalted cod portions thoroughly dry.
Warm 1/4 cup of the olive oil in a wide skillet over medium-low heat. Add the onion and half of the sliced garlic, then cook slowly until soft and lightly golden, about 10 minutes.
Add the sliced piquillo peppers and continue cooking over low heat for about 30 minutes, stirring occasionally, until very tender and concentrated.
Set a fine-mesh strainer over a bowl and drain the pepper mixture, pressing gently to collect its flavorful oil and juices while keeping the peppers and onion intact for serving.
While the peppers cook, place the cod in a snug baking dish and spoon 1/3 cup of the olive oil over it. Bake for 10 to 12 minutes, until the fish is opaque, flakes easily, and reaches 145°F (63°C) in the thickest part.
Warm the remaining olive oil in a small skillet over low heat. Add the remaining garlic and the whole dried chile, then cook until the garlic is pale golden without allowing it to brown deeply.
Pour the hot garlic, chile, and their oil over the baked cod. Carefully transfer the cod to a warm plate, leaving the gelatin-rich cooking juices and oil in the baking dish.
Combine the cod cooking juices with the reserved pepper drippings, fish stock, and cider vinegar. Whisk steadily until the mixture becomes lightly emulsified and glossy, warming it gently if needed but not allowing it to boil.
Divide the pepper and onion mixture among four plates, place a cod portion on each serving, and spoon the emulsified sauce over and around the fish.
Garnish each portion with the golden garlic slices and serve immediately, leaving the whole chile aside unless diners want extra heat.

Notes

Ready-desalted salt cod may be found at Spanish, Portuguese, Caribbean, or Latin American markets. Thick fresh cod loin is a practical US supermarket alternative, although the flavor will be milder and the sauce may contain less natural gelatin.

When starting with fully salted cod, soak it in cold water in the refrigerator for 24 to 48 hours, changing the water about every 8 hours. This desalting time is not included in the preparation time.

Piquillo peppers from Lodosa have a distinctive sweet, gently smoky flavor. Jarred roasted red peppers are the most practical US alternative when piquillos are unavailable; drain them thoroughly before slicing.

To retain the listed free-from formulation, use fish stock whose ingredient label contains no wheat, dairy, egg, soy, sesame, peanut, tree nut, or shellfish ingredients.

The calorie estimate assumes the four cod portions weigh about 6 ounces each and approximately 6 tablespoons of the olive oil used in cooking remain in the peppers, fish, and finished sauce.

The dietary and intolerance categories describe the written formulation only and do not guarantee the absence of cross-contact.