Summary: Kokotxas in green sauce are one of the pillars of Basque cuisine. This recipe guides you step-by-step to achieve a silky green sauce, with the perfect amount of parsley and fish broth, that envelops the kokotxas in a sea-flavored embrace. Simpler than pil pil but equally spectacular.
Table of Contents
Green Sauce: A Tradition of Basque Cuisine
Green sauce is one of the oldest and most beloved preparations in Basque and Cantabrian cuisine. Its origin dates back to the kitchens of Cantabrian fishermen, who used what they had at hand — oil, garlic, parsley from the garden, and broth from the fish itself — to create a sauce that enhanced the flavor of the product without masking it.
Unlike pil pil, which is a pure emulsion of oil and gelatin, green sauce incorporates watery elements (fish broth, white wine) and herbaceous elements (plenty of parsley) that give it a completely different character. It is lighter, fresher, and technically more accessible, making it an excellent option for those new to cooking kokotxas.
In the Basque Country, green sauce is applied to all types of fish — hake, monkfish, cod — but it reaches its maximum expression with kokotxas. The gelatin released by the kokotxas during cooking integrates with the broth and oil, creating a naturally thickened sauce without the need for artificial thickeners.
At Mercat del Ninot in Barcelona, where we have specialized in Icelandic cod since 1990, kokotxas in green sauce are the preparation we most recommend to those who want to discover this product. It is more forgiving than pil pil — it tolerates temperature and timing errors better — and the result is equally extraordinary.
Ingredients for 4 people
- 500 g cod kokotxas (fresh, thawed, or from desalted cod)
- 150 ml extra virgin olive oil
- 4 cloves garlic, peeled and finely chopped
- 1 tablespoon flour (optional, to help thicken)
- 200 ml fish broth (homemade or good quality)
- 100 ml dry white wine
- 1 large bunch fresh parsley, very finely chopped
- 1 dried chili pepper (optional)
- Salt (adjust depending on whether the kokotxas are from salted cod)
Notes on ingredients
Fish broth: The broth makes all the difference. Ideally, make it homemade with hake or monkfish bones and heads, onion, leek, carrot, and a splash of white wine. Cook it for 30 minutes and strain it. If you don't have time, use a good quality fish broth in a glass jar, never concentrated broth cubes.
Parsley: It must be fresh flat-leaf parsley (not curly). It is the soul of the green sauce. Chop it at the last minute so it doesn't lose its color or aroma. You'll need quite a bit — a large bunch, at least 4-5 tablespoons finely chopped.
White wine: Dry and young. A Txakoli, Verdejo, or Albariño work perfectly. Avoid sweet or very aromatic wines.
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Step-by-step recipe
Step 1: Prepare the kokotxas
If they are salted cod, desalt them in cold water in the refrigerator for 12-24 hours, changing the water 3-4 times. If they are fresh or thawed, season them lightly with salt and set aside.
Pat the kokotxas dry with paper towels. If you want the sauce to thicken better, you can lightly flour the kokotxas before cooking. The flour on the kokotxas will help to naturally thicken the sauce.
Step 2: Prepare the sauce base
In a wide saucepan (preferably earthenware), heat the olive oil over medium-low heat. Add the chopped garlic and chili pepper. Sauté for 2-3 minutes until the garlic is lightly golden, stirring constantly to prevent it from burning.
If using flour, add it now: a level tablespoon over the garlic. Stir for 30 seconds to cook the flour and remove its raw taste, but without letting it brown.
Step 3: Add wine and broth
Raise the heat slightly and add the white wine. Let it reduce for 1-2 minutes, evaporating the alcohol. The smell of alcohol should completely disappear.
Add the hot fish broth (it's important that it's hot to avoid stopping the cooking process). Stir well and let the sauce simmer gently for 3-4 minutes. The sauce should begin to thicken slightly.
Step 4: Cook the kokotxas
Lower the heat to medium-low. Place the kokotxas in the saucepan in a single layer, skin side up. Cook them for 3-4 minutes without touching them.
Carefully turn the kokotxas over. Cook for another 2-3 minutes. Meanwhile, move the saucepan with gentle circular motions so that the gelatin from the kokotxas integrates with the sauce and it thickens.
Step 5: Add the parsley and serve
When the kokotxas are cooked (firm but juicy), remove the saucepan from the heat. Add plenty of chopped parsley — this is the key moment. The parsley is added off the heat so that it retains its intense green color and fresh aroma.
Move the saucepan in circles to integrate the parsley with the sauce. If the sauce is too thick, add a little more broth. If it's too liquid, put the saucepan back on the heat for one more minute without the kokotxas until it reduces.
Serve immediately in the earthenware pot, with bread for dipping.
Differences between pil pil and green sauce
| Aspect | Pil pil | Green Sauce |
|---|---|---|
| Base | Only oil + gelatin | Oil + broth + wine + parsley |
| Texture | Dense, creamy emulsion | Light, fluid sauce |
| Color | White-yellowish | Intense green |
| Difficulty | High (delicate emulsion) | Medium (more forgiving) |
| Flavor | Intense, pure oil and garlic | Fresh, herbaceous, complex |
| Time | 30-40 minutes | 20-25 minutes |
| Best for | Cod kokotxas | Any kokotxa or fish |
Both preparations are equally legitimate and delicious. The choice depends on personal taste and skill level. If it's your first time with kokotxas, we recommend starting with green sauce — it's more forgiving and the result is spectacular.
Professional tips for the perfect sauce
- Homemade broth: A homemade fish broth makes a huge difference. With 30 minutes of cooking hake bones, an onion, a leek, and salt, you have the perfect base.
- Parsley at the end: Always off the heat. If you add it while the sauce is boiling, it will oxidize and lose its bright green color.
- Circular motion: Move the saucepan, do not stir with a spoon. The circular motion integrates the gelatin with the sauce without breaking the kokotxas.
- Do not cover: The saucepan is cooked uncovered so that the sauce reduces and concentrates the flavor.
- Fresh peas: If it's in season (April-June), add fresh peas 5 minutes before the kokotxas. It's a classic accompaniment that adds sweetness and color.
- Clams: For a more complete dish, add steamed clams. Open them separately with a little white wine and incorporate them with their juice into the green sauce at the end.
Pairing and accompaniment
Kokotxas in green sauce is a dish that calls for a white wine with some structure but without excessive oak. The best options are:
- Txakoli: The classic Basque option. Its acidity and slight fizz cleanse the palate between bites.
- Albariño: Especially those from Rías Baixas, with their Atlantic minerality that connects with the sea flavor of the kokotxas.
- Godello: A white from Valdeorras provides body without losing freshness.
- Rioja white: Barrel-fermented for a more complex pairing, especially if the kokotxas are from cod with an intense flavor.
As an accompaniment, in addition to bread (essential for the sauce), classic options include:
- White rice to absorb the sauce
- Sliced boiled potatoes
- White asparagus from Navarre
- Baby peas (in season)
Frequently asked questions
Can I make green sauce with frozen kokotxas?
Yes, frozen kokotxas work very well in green sauce. Thaw them in the refrigerator for 12-24 hours and dry them well before cooking. The result is practically the same as with fresh ones, as the gelatin is well preserved during freezing.
How much parsley do I need for green sauce?
You need a large bunch of fresh flat-leaf parsley, approximately 4-5 tablespoons once finely chopped. Parsley is the star of green sauce, so don't skimp. Use only the leaves, not the stems (though you can add the stems to the fish broth).
Can green sauce be made without white wine?
Yes, you can substitute white wine with more fish broth and a splash of lemon juice to add acidity. The result will be slightly different but equally delicious. It's a good option if you don't want to use alcohol in your cooking.
How long do kokotxas in green sauce last?
Kokotxas in green sauce are ideally consumed freshly made, but you can store them in the refrigerator for up to 24 hours. Reheat them over very low heat without boiling, as kokotxas harden with excessive heat. Add fresh parsley when reheating.
Is flour obligatory for green sauce?
No. Flour is optional and helps to thicken the sauce, but it is not necessary. The natural gelatin from the kokotxas thickens the sauce on its own if you move the saucepan correctly. If you prefer a gluten-free version, omit the flour and let the sauce thicken naturally.
What other fish can I prepare in green sauce?
Green sauce is versatile and works with many fish: hake (in slices or fillets), monkfish, cod (whole fillets), sea bass, and gilt-head bream. It's also excellent with clams, which open directly in the sauce. The technique is the same — the key is the broth, parsley, and the circular motion of the saucepan.
Conclusion
Kokotxas in green sauce are the perfect dish to discover the magic of this unique cut of fish. More accessible than pil pil but equally delicious, this recipe allows you to enjoy kokotxas at their best: tender, gelatinous, enveloped in a vibrant green sauce full of sea flavor and fresh parsley.
The key to success lies in three elements: quality kokotxas with intact skin, a good fish broth, and plenty of fresh parsley added at the last moment. With these three ingredients well executed, you have a dish worthy of any Basque restaurant. And if you have leftover sauce — which you will — dip bread until the last drop. It's the best part.
