Bacalao a la Vizcaína is a classic Basque recipe of tender salted cod served with a rich, silky sauce made from slowly caramelized onion, garlic, dried choricero pepper and bread. The sauce takes a little patience, but the technique is simple and the result is deeply flavorful.
Bacalao a la VizcainaBasque-Style Cod in Biscayan Pepper Sauce
The Genius of Bacalao a la Vizcaína
Few dishes in northern Spain embody the alchemy of coastal cooking quite like Bacalao a la Vizcaína (Basque-Style Cod in Red Pepper Sauce). Originating in the Basque Country, this dish transforms a modest set of ingredients—salted cod, sweet onions, and the iconic pimiento choricero—into an intensely savory, velvety sauce. What makes it so extraordinary isn’t complex technique, but rather the way these simple ingredients work together.
The secret lies in patience. The onions are slowly cooked until deeply sweet and tender, while the pimiento choricero brings a rich, fruity depth without adding heat. A slice of fried bread gives the sauce body, creating its characteristic silky texture without relying on cream or butter.
Historically, salt cod became an important ingredient in northern Spanish cooking because it could be preserved, transported and stored long before refrigeration. In the Basque Country, it became the foundation for some of the region’s most iconic dishes, including Bacalao a la Vizcaína. The sauce itself is particularly distinctive because, unlike many Spanish preparations, its deep red color traditionally comes from dried choricero peppers rather than tomatoes.
And then comes the best part: letting the cod rest in that beautiful sauce before serving it with a generous piece of crusty bread. The result is rustic, deeply flavorful and unmistakably Basque.
Ready to explore more of Spain’s coastal cooking? Head over to our comprehensive guide to traditional Spanish seafood for regional classics, from Basque and Galician fish dishes to Mediterranean seafood and Andalusian coastal recipes.
Ingredients
| Ingredient | Metric Amount | Imperial Amount | Preparation |
| Desalted Cod Loin | 400 g | 14 oz | ~2 pieces (bacalao desalado) |
| Red Onion | 400 g | 14 oz | Thinly sliced into rings/strips |
| Garlic | 2 cloves | 2 cloves | Thinly sliced |
| Pimiento Choricero Paste | 2 tbsp | 2 tbsp | Rehydrated dried sweet pepper pulp |
| Rustic Bread | 1 slice | 1 slice | Stale white or sourdough bread for thickening |
| Extra Virgin Olive Oil | To taste | To taste | Generous amount for poaching & sauce |
| Salt | To taste | To taste | Fine sea salt |
Instructions
1. Toast the bread
Heat a generous drizzle of extra virgin olive oil in a frying pan over medium heat.
Add the slice of bread and fry until golden on both sides.
Remove and set aside.
2. Slowly caramelize the onion
Add more olive oil to the same pan if necessary.
Add the 400 g (14 oz) sliced red onion and a small pinch of salt.
Cook over low heat for 15–20 minutes, stirring occasionally, until the onion is very soft, sweet and deeply softened.
Add the sliced garlic during the last few minutes of cooking so it becomes fragrant without burning.
3. Make the Vizcaina sauce
Add the toasted bread and 2 tablespoons of pimiento choricero paste to the onion.
Cook for about 5 minutes, gently breaking up the bread with a wooden spoon and stirring until the choricero paste is evenly distributed.
Remove from the heat and allow the mixture to cool slightly.
Transfer to a blender and blend until completely smooth and silky.
If the sauce is too thick, add a small splash of water to reach a spoonable consistency.
4. Cook the cod
Heat a little olive oil in a separate frying pan over medium heat.
Place the cod skin-side down and cook for about 2 minutes.
Carefully turn the cod over.
5. Finish in the sauce
Pour the warm Vizcaina sauce around and over the cod.
Reduce the heat to very low, or remove the pan from the heat and use the residual heat to finish cooking the fish for about 3 minutes, depending on the thickness of the loins.
The cod should remain moist and just begin to flake.
6. Rest and serve
Let the cod rest in the sauce for a few minutes before serving.
This short rest allows the fish to absorb some of the sauce while the flavors settle.
Serve generously with the Vizcaina sauce and, most importantly, plenty of good crusty bread for dipping.
Chef’s Notes for Bacalao a la Vizcaina
Why should I cook the onion slowly? Don’t rush the onion. Cooking it gently for 15–20 minutes develops its natural sweetness and gives the Vizcaina sauce its characteristic depth. Keep the heat low and let it soften rather than brown aggressively.
What is pimiento choricero? Pimiento choricero is a dried red pepper traditionally used in Basque and northern Spanish cooking. Its flesh is sweet, fruity and mildly flavored rather than spicy. Jarred pimiento choricero paste is a convenient option for home cooks and works perfectly here.
Why use red onion? Red onion is a particularly good choice for this recipe because its sweetness and color are close to the traditional onions used in many versions of salsa vizcaína. The exact onion used can vary, but what matters most is cooking it slowly until completely soft.
Why let the cod rest in the sauce? That short resting time allows the sauce to settle around the fish and gives the cod time to absorb some of its rich flavor. Don’t skip the bread either—the sauce is arguably the best part of the dish.
Common Mistakes cooking Bacalao a la Vizcaina
Rushing the onion: High heat may brown the onion quickly, but it won’t develop the same sweet, concentrated flavor. Low and slow is the key.
Burning the garlic: Garlic becomes bitter when overcooked. Add it toward the end of the onion’s cooking time rather than letting it fry for the entire 15–20 minutes.
Overcooking the cod: Desalted cod loins are delicate. They only need a few minutes to finish cooking. Keep the heat gentle and remove them as soon as the flesh becomes opaque and flakes easily.
Bacalao a la Vizcaina Swaps & Variations
Use dried choricero peppers: For a more traditional approach, use whole dried pimiento choricero peppers. Soak them in hot water, scrape out the softened flesh and use it in place of the prepared paste.
Use another type of onion: Red onion works particularly well here, but you can use yellow or sweet onion if that’s what you have available. The important thing is to cook it slowly until very soft.
Make the sauce extra silky: For an exceptionally smooth sauce, pass the blended Vizcaina sauce through a fine-mesh sieve before returning it to the pan. This is optional, but gives the finished dish a restaurant-style texture.
Recipe Card
Basque-Style Cod in Biscayan Pepper Sauce (Bacalao a la Vizcaina)
Bacalao a la Vizcaína is a classic Basque recipe of tender salted cod served with a rich, silky sauce made from slowly caramelized onion, garlic, dried choricero pepper and bread. The sauce takes a little patience, but the technique is simple and the result is deeply flavorful.
Ingredients
- 2 desalted cod loin pieces, about 400 g (14 oz) total
- 400 g (14 oz) red onion, thinly sliced
- 2 garlic cloves, thinly sliced
- 2 tablespoons pimiento choricero paste
- 1 slice of rustic bread
- Extra virgin olive oil
- Salt
Instructions
1. Toast the bread
Heat a generous drizzle of extra virgin olive oil in a frying pan over medium heat.
Add the slice of bread and fry until golden on both sides.
Remove and set aside.
2. Slowly caramelize the onion
Add more olive oil to the same pan if necessary.
Add the 400 g (14 oz) sliced red onion and a small pinch of salt.
Cook over low heat for 15–20 minutes, stirring occasionally, until the onion is very soft, sweet and deeply softened.
Add the sliced garlic during the last few minutes of cooking so it becomes fragrant without burning.
3. Make the Vizcaina sauce
Add the toasted bread and 2 tablespoons of pimiento choricero paste to the onion.
Cook for about 5 minutes, gently breaking up the bread with a wooden spoon and stirring until the choricero paste is evenly distributed.
Remove from the heat and allow the mixture to cool slightly.
Transfer to a blender and blend until completely smooth and silky.
If the sauce is too thick, add a small splash of water to reach a spoonable consistency.
4. Cook the cod
Heat a little olive oil in a separate frying pan over medium heat.
Place the cod skin-side down and cook for about 2 minutes.
Carefully turn the cod over.
5. Finish in the sauce
Pour the warm Vizcaina sauce around and over the cod.
Reduce the heat to very low, or remove the pan from the heat and use the residual heat to finish cooking the fish for about 3 minutes, depending on the thickness of the loins.
The cod should remain moist and just begin to flake.
6. Rest and serve
Let the cod rest in the sauce for a few minutes before serving.
This short rest allows the fish to absorb some of the sauce while the flavors settle.
Serve generously with the Vizcaina sauce and, most importantly, plenty of good crusty bread for dipping.
Notes
2 serves
Nutrition Information:
Yield:
2Serving Size:
1Amount Per Serving: Calories: 215Total Fat: 2gSaturated Fat: 0gUnsaturated Fat: 1gCholesterol: 44mgSodium: 2086mgCarbohydrates: 29gFiber: 4gSugar: 11gProtein: 22g
