Summary: Cod kokotxas (cocochas in Spanish) are the most prized and scarce part of the cod: a small gelatinous muscle located under the fish's chin, with only two obtained per specimen. In this complete guide, we explain exactly what they are, why their price is so high, the differences between fresh, salted, and frozen, how to prepare them "al pil pil," in green sauce, and breaded, where to buy them, and everything you need to know to enjoy this delicacy.
Table of Contents
- What are kokotxas: cod anatomy
- Why kokotxas are so expensive
- Cod kokotxas vs. hake kokotxas
- Fresh, salted, frozen: which to choose
- Season and availability
- Recipe: Cod kokotxas al pil pil
- Other preparations: green sauce, breaded, and grilled
- Tips for emulsifying pil pil with kokotxas
- Where to buy quality cod kokotxas
- Storage and handling
- Kokotxas in Basque haute cuisine
- Frequently Asked Questions
What are kokotxas: cod anatomy
Kokotxas -- cocochas in Spanish -- are a small, oval-shaped muscle located in the lower part of the cod's head, exactly between the lower jaw and the throat. This muscle is responsible for the movement of the gills, and due to its constant activity during the fish's life, it develops an extraordinary concentration of collagen and gelatin.
Each cod only has two kokotxas, one on each side of the chin. They are small pieces, weighing between 20 and 40 grams each, depending on the size of the specimen. Their shape is oval, slightly flattened, with one smooth side and another with a thin, gelatinous membrane. When raw, they are firm but elastic; when cooked, they transform into extraordinarily tender, juicy, and unctuous bites.
What makes kokotxas unique is not only their flavor -- intense, concentrated, and marine -- but also their gelatinous texture. No other part of cod, or any other fish, offers this combination of tenderness and collagen. It is precisely this collagen that makes them the perfect ingredient for pil pil: the gelatin they release when cooked emulsifies with the oil almost spontaneously, creating a sauce that with cod loins requires much more work and patience.
Why kokotxas are so expensive
The price of cod kokotxas ranges between 40 and 80 euros per kilo depending on the format (fresh, salted, or frozen) and the season. For those unfamiliar with them, this price may seem exorbitant. But there is a logical explanation based on five factors:
- Mathematical scarcity: a 5-6 kg cod produces barely 40-80 g of kokotxas. To serve a 400 g dish (4 diners), you need the kokotxas from 10 to 20 cod. The ratio between usable product and raw material is minimal.
- Manual extraction: kokotxas are extracted by hand from the cod's head, one by one. It is an artisanal job that cannot be mechanized and requires skill not to damage the piece.
- Irreplaceable texture: there is no substitute. No other piece of any fish replicates the combination of gelatin, tenderness, and flavor of cod kokotxas. This gives them an exclusive value.
- Haute cuisine demand: Michelin-starred restaurants in the Basque Country, Cantabria, and Navarre compete for the best kokotxas. This professional demand constantly pushes prices up.
- Concentrated flavor: being a small but very active muscle (cod uses it continuously to breathe), it concentrates more flavor per gram than any other part of the fish. It is pure flavor, without water or filler fiber.
However, the perspective changes when you calculate the cost per diner. With 400 g of kokotxas (about 25-35 euros), you prepare a main course for 4 people that in a Basque restaurant would cost between 30 and 50 euros per diner. At home, the real cost per person is around 7-9 euros for a dish of superior gastronomic category.
Cod kokotxas vs. hake kokotxas
Hake kokotxas are the other great reference for this cut in Spanish cuisine. Both have their virtues, but they are different products that behave differently in the kitchen.
| Characteristic | Cod kokotxas | Hake kokotxas |
|---|---|---|
| Texture | Very gelatinous, firm, unctuous | More delicate, tender, less gelatinous |
| Flavor | Intense, saline, deep | Subtle, mild, more neutral |
| Collagen | Very high (ideal for pil pil) | Moderate (pil pil more difficult) |
| Size | 20-40 g per unit | 15-30 g per unit |
| Formats | Fresh, salted, frozen | Fresh, frozen (rarely salted) |
| Price/kg | 40-80 euros | 30-60 euros |
| Best preparation | Pil pil (emulsifies itself) | Green sauce, breaded |
| Availability | Year-round (salted and frozen) | Seasonal (fresh) or frozen |
For pil pil, cod kokotxas are clearly superior: their high collagen content makes the sauce emulsify almost on its own. Hake kokotxas produce a paler and less dense pil pil. However, for breading or grilling, hake kokotxas are excellent for their delicacy. They are not interchangeable; they are complementary.
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Fresh, salted, frozen: which to choose
Kokotxas are sold in three formats, and each has its advantages depending on the preparation you are going to make:
Fresh kokotxas: come directly from the fish market, without any preservation treatment. They have a delicate flavor and a particularly tender texture. They are the most difficult to find because their freshness window is very short (2-3 days from extraction). Best for breading or grilling, where their delicacy shines.
Salted kokotxas: cured in salt like cod itself. Salting concentrates the flavor, increases firmness, and, most importantly, intensifies the release of gelatin during cooking. They are ideal for pil pil and green sauce. They require prior desalting for 12-16 hours in cold water. Bacalalo's salted cod kokotxas are the most authentic format for traditional Basque recipes.
Frozen kokotxas: flash-frozen after capture to preserve their freshness. They are the most accessible format and available year-round. They work for any preparation, although they release slightly less gelatin than salted ones. To thaw them, transfer them from the freezer to the refrigerator 12 hours before cooking. Never thaw them in the microwave or in hot water.
Season and availability
The availability of kokotxas varies by format and species:
- Salted cod kokotxas: available all year round. Salting is a preservation method that allows for permanent stock. It is the most reliable format if you want to cook kokotxas at any time.
- Fresh cod kokotxas: the cod fishing season in the North Atlantic runs from January to April (main season) and from September to November (secondary season). Outside these windows, finding fresh cod kokotxas is very difficult.
- Fresh hake kokotxas: more regularly available in markets in northern Spain, especially between October and March. In the rest of Spain, they appear sporadically.
- Frozen kokotxas: available all year round, both cod and hake. This is the most practical option for those living far from the coast or specialized markets.
Practical advice: if you see fresh kokotxas in your market, buy them. They are not a product you can decide to buy tomorrow, because tomorrow they probably won't be there. If you plan a recipe in advance, salted or frozen are the safe choice.
Recipe: Cod kokotxas al pil pil
Ingredients for 4 servings
- 400 g cod kokotxas (desalted if salted, thawed if frozen)
- 250 ml mild extra virgin olive oil (Arbequina or similar)
- 4 cloves garlic, thinly sliced
- 1 dried chili pepper (optional, for a subtle spicy kick)
Step-by-step preparation
- Desalt the kokotxas (if salted): submerge them in cold water for 12-16 hours, changing the water 2-3 times. Kokotxas, being small pieces, desalt faster than loins. Test one by biting an end: it should be salty but not aggressively so. Dry them thoroughly with paper towels.
- Confit the garlic: in an earthenware casserole (essential for maintaining temperature) or a heavy-bottomed pan, pour the oil and add the sliced garlic and chili pepper. Heat over very low heat until the garlic is light golden, 5-6 minutes. Do not burn them: bitter garlic ruins the whole dish. Remove the garlic and chili pepper with a slotted spoon and set aside.
- Cook the kokotxas: with the flavored oil over minimum heat (it should not bubble), place the kokotxas in a single layer without overlapping. Cook for 3-4 minutes on each side. You will see them release an abundant whitish gelatin: this gelatin is the base of the sauce. Do not raise the heat; gelatin is released with gentle heat.
- Remove the kokotxas: take them out with a slotted spoon to a plate and set aside. The oil loaded with gelatin remains in the casserole: this is the gold of the dish.
- Emulsify the pil pil sauce: remove the casserole from the heat. Begin to move it with circular and back-and-forth motions, as if shaking a sieve. The emulsion forms when the gelatin dissolved in the oil combines with the movement. With kokotxas, pil pil emulsifies much faster than with loins: in 3-5 minutes you should have a dense, creamy, and whitish-yellow sauce.
- Return the kokotxas to the sauce: once emulsified, put the kokotxas back into the casserole, place the golden garlic on top, and bathe everything with the sauce. If the sauce is too thick, add a few drops of warm water and stir again.
Total time: 25-30 active minutes (not including prior desalting). Serve immediately, directly in the earthenware casserole, with crusty bread for dipping. The bread for the leftover sauce is almost as important as the kokotxas themselves.
Other preparations: green sauce, breaded, and grilled
Kokotxas in green sauce: the other great Basque recipe. Unlike pil pil, which only contains oil, garlic, and the fish's own gelatin, green sauce incorporates parsley, white wine, and sometimes peas and clams. The procedure is similar to cod in green sauce, but with the advantage that kokotxas release more gelatin and the sauce emulsifies more easily. Add a spoonful of flour to the oil before the white wine, incorporate 100 ml of dry white wine, a glass of fish stock, and the peas. Cook the kokotxas for 3-4 minutes per side and finish with plenty of fresh chopped parsley.
Breaded kokotxas: a classic from Basque cider houses. Dry the kokotxas well, coat them in flour and beaten egg, and fry them in hot oil (180 C) for 2-3 minutes. The breading should be thin so that the inner gelatinous texture is appreciated. It is the simplest and one of the most gratifying preparations: crispy on the outside, melting on the inside. Serve with a very cold txakoli.
Grilled kokotxas: the minimalist option. On a very hot griddle or pan with a drizzle of oil, sear the kokotxas for 1-2 minutes on each side. Season with Maldon salt and a splash of extra virgin olive oil. The result is intense, direct, and demands top-quality kokotxas. Only recommended with fresh or top-tier frozen kokotxas.
Tips for emulsifying pil pil with kokotxas
Kokotxa pil pil is easier to emulsify than loin pil pil, but there are still tricks that make a difference:
- Minimum heat always: gelatin is released better at low temperatures. If the oil bubbles, the proteins denature and do not emulsify correctly.
- Earthenware casserole: retains heat evenly and allows the emulsion to form gradually. A stainless steel pan cools too quickly.
- Do not use a spatula: the sauce is emulsified by moving the casserole, not by stirring with a spoon. The movements should be circular, back-and-forth, and gentle. It's a rocking motion, not shaking.
- If it doesn't emulsify, add a few drops of warm water: water helps the emulsion. Not hot, not cold: warm. A few drops, not a stream.
- Patience between batches: if you cook many kokotxas, do it in two batches in the same casserole. The first batch will load the oil with gelatin; the second will benefit from already enriched oil.
- Salted kokotxas emulsify better: salt curing breaks down collagen fibers and facilitates their release. If you're looking for the densest and creamiest pil pil, salted kokotxas are the right choice.
Where to buy quality cod kokotxas
Finding cod kokotxas is not like buying a hake fillet at the supermarket. They are a niche product that requires searching in the right channels:
- Specialized bacalao shops: Bacalalo's salted cod kokotxas are available year-round and arrive with refrigerated shipping in optimal conditions. It is the most convenient and reliable option for those who do not live near a physical bacalao shop.
- Northern municipal markets: the bacalao stalls at Mercado de la Ribera (Bilbao), Mercado de la Bretxa (San Sebastián), or Mercado de la Esperanza (Santander) usually have salted kokotxas regularly. In markets in the rest of Spain, availability is more irregular.
- Specialized online purchase: the main advantage of buying online is the guarantee of availability and product traceability. You do not depend on the luck of your local market having them that day.
Distrust excessively cheap kokotxas (below 30 euros/kg): they may be from inferior fish or of dubious origin. Authentic cod kokotxas, especially those from North Atlantic cod (Iceland, Norway, Faroe), have a price that reflects their quality and scarcity.
Storage and handling
Kokotxas require careful handling due to their high gelatin content and small size:
- Unsalted salted kokotxas: stored in the refrigerator for up to 3 months in their original packaging, covered with salt. Salt acts as a natural preservative.
- Desalted kokotxas: once desalted, consume within 24 hours. Desalting removes the protective preservative of the salt, and the piece begins to deteriorate rapidly.
- Fresh kokotxas: maximum 2-3 days in the refrigerator, at 0-4 C, covered with plastic wrap. The smell should be of clean sea, never ammonia.
- Frozen kokotxas: always thaw in the refrigerator (12 hours). Once thawed, do not refreeze.
- Cooked kokotxas: consume immediately. The gelatinous texture of kokotxas suffers greatly from reheating and waiting. Pil pil, especially, does not tolerate reheating.
Kokotxas in Basque haute cuisine
Kokotxas are not just a home ingredient: they are protagonists on the menus of the most prestigious restaurants in the Basque Country and throughout Spain. Their gelatinous texture, concentrated flavor, and versatility make them a perfect canvas for culinary creativity.
In Michelin-starred restaurants in the Basque Country, kokotxas appear in preparations ranging from the most traditional pil pil to avant-garde interpretations with modern cooking techniques. Arzak's kokotxas al pil pil, Mugaritz's kokotxas with parmentier, Martin Berasategui's confited kokotxas, or Eneko Atxa's crispy kokotxas are dishes that have defined tasting menus for decades.
What makes kokotxas special in haute cuisine is that they are a humble ingredient elevated to excellence. For centuries, cod heads (from which kokotxas are extracted) were considered a byproduct of lesser value. It was Basque chefs who recognized the treasure they hid and transformed them into one of the most coveted pieces of Spanish gastronomy. It is a perfect example of salvage cooking converted into haute cuisine.
Frequently Asked Questions
What is the difference between cocochas and kokotxas?
They are exactly the same product. "Kokotxa" is the original term in Euskera (Basque language), while "cococha" is the phonetic Castilianization that has spread to the rest of Spain. In the Basque Country, Navarre, and parts of the Cantabrian coast, both terms are used interchangeably. In haute cuisine restaurants, "kokotxas" is more frequently seen on the menu, out of respect for the Basque origin of the term and culinary tradition.
Can hake kokotxas be made al pil pil?
Yes, it is possible, but the result is different. Hake kokotxas have less collagen and gelatin than cod kokotxas, which means that the pil pil sauce emulsifies with more difficulty and is less dense. You will need more patience, longer movements, and it is likely that the sauce will not reach the thick creaminess of cod pil pil. For a first attempt at pil pil, cod kokotxas are always more rewarding.
How long do cod kokotxas need to be desalted?
Salted kokotxas need between 12 and 16 hours of desalting in cold water, changing the water 2-3 times during the process. Being much smaller pieces than cod loins or chunks, they desalt significantly faster. The definitive test is to bite an end of a raw kokotxa: it should have a pleasant salty taste but not an aggressive one. If it stings or is excessively salty, it needs more time.
Can cooked kokotxas be frozen?
It is absolutely not recommended. The gelatinous and tender texture of kokotxas deteriorates severely with freezing once cooked: they lose their juiciness, become rubbery, and the pil pil sauce breaks when thawed. Kokotxas are a dish to prepare and consume immediately. If you have leftover raw kokotxas, freeze them before cooking, not after.
How many cod kokotxas do I serve per person?
As a main course, calculate 100 g per person, which is approximately 4-6 kokotxas depending on their size. As a starter or tapa, half (50 g, 2-3 kokotxas) is enough. With 400 g of kokotxas, you prepare a generous main course for 4 people. Keep in mind that kokotxas are very filling due to their gelatin content, so it is better to underestimate than to overestimate.
Why are cod kokotxas so expensive?
The fundamental reason is scarcity: each cod only has 2 kokotxas, which is barely 40-80 grams of product per 5-6 kg specimen. The extraction is manual and artisanal. Added to this is a growing demand from high-end restaurants. The combination of extremely limited supply and high demand means that the price reflects a market reality, not speculation.
What wine do I pair with kokotxas al pil pil?
Txakoli is the excellent pairing: its vibrant acidity and natural bubbles cleanse the palate of the unctuousness of the pil pil. An Albariño from Rías Baixas or a Verdejo from Rueda also work well. If you prefer red, a young Rioja with little oak can accompany without overpowering. What you should avoid are wines with a lot of oak, sweet wines, or full-bodied rosés, which would clash with the delicacy of the dish.
Can I cook kokotxas in a regular pan instead of an earthenware casserole?
You can, but the earthenware casserole offers significant advantages. Clay retains heat gradually and uniformly, which favors slow cooking and the release of gelatin. In addition, it allows you to emulsify the pil pil by moving the casserole directly, which is more awkward with a long-handled pan. If you use a pan, choose a heavy-bottomed one and compensate with an even lower heat to emulate the thermal inertia of clay.
What do I do if my pil pil doesn't emulsify?
Cod kokotxa pil pil is much easier to emulsify than loin pil pil, but if it doesn't emulsify, try these rescues: add a few drops of warm water and continue moving the casserole in circular motions. Make sure the casserole is off the heat while you emulsify. If the oil is too hot, the emulsion will not form. Another option is to add a raw kokotxa to the oil to release additional gelatin and try again.
Do kokotxas have bones?
No. Kokotxas are a clean muscle, without bones, without scales, and without spines. This is one of their great advantages as an ingredient: they do not require any cleaning work beyond desalting if they are salted. They are clean pieces ready to cook, which makes them especially convenient and safe even for serving to children or people who fear fish bones.
Can kokotxas be baked?
They can be, but it is not the most common preparation nor the one that suits them best. When baked, kokotxas tend to lose their gelatin without it integrating into a sauce, and the final texture can be drier than with other techniques. If you want to try, place them in a dish with oil, sliced garlic, and a splash of white wine at 180 C for 10-12 minutes. The result is correct but does not reach the level of pil pil or green sauce.
Where can I buy cod kokotxas online?
Salted cod kokotxas are available at Bacalalo with refrigerated shipping throughout Spain. By buying online from a specialized bacalao shop, you have the guarantee that the product is authentic North Atlantic cod, with complete traceability and in the correct storage conditions. Avoid generalist marketplaces where origin and cold chain are not always guaranteed.
Related Guides
- Cod al pil pil: Basque recipe step by step
- Cod in green sauce with parsley and clams
- Cod a la bilbaína: Club Ranero recipe
- How to desalt cod quickly and well at home
- Where to buy quality salted cod online
- Recipes with desalted cod: quick and easy ideas
- Cod with chickpeas: traditional stew
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