Summary: If you've ever bought desalted cod loins from a supermarket and a specialized fishmonger, and cooked them in the same way, you'll have noticed a difference that goes beyond price. Supermarket ones tend to be dry, lack texture, and have an erratic salt level. Quality ones flake perfectly, have body, flavor, and hold up to cooking. This difference is not subjective perception: there are clear technical reasons behind it.
At Bacalalo, we've been selecting cod with discernment since 1990 in Barcelona's Mercat del Ninot. In this guide, we explain exactly what to look for when buying desalted cod loins, what the real differences are compared to supermarket products, and how to get the most out of the product.
Content
- What exactly is a desalted cod loin?
- Why is there such a difference between desalted cod loins?
- How to recognize a quality desalted cod loin at the counter
- Desalted cod loins vs. Mercadona and other supermarkets: the real comparison
- Desalted cod formats and when to use each one
- How to cook desalted cod loins without ruining them
What exactly is a desalted cod loin?
Cod loin is the dorsal part of the cod (Gadus morhua or other species of the genus Gadus), the meatiest and most uniform area of the fish. It is the most culinarily valued part because:
- It has uniform thickness, which facilitates homogeneous cooking.
- It is the area with more muscle and less fat than the belly.
- It has fewer bones than other parts.
- It withstands more demanding cooking methods well (confit, pil-pil, grilling).
A desalted loin is that same loin that has already gone through the soaking process in cold water to remove excess salt, ready to cook directly without additional preparation.
Why is there such a difference between desalted cod loins?
The difference in quality between a desalted cod loin from a supermarket and one from a specialized fishmonger has several explanations:
1. The species
The reference cod for gastronomy is Gadus morhua, the North Atlantic cod. However, other species are marketed under the generic name "cod":
- Gadus morhua: the authentic North Atlantic cod. Better texture, more complex flavor.
- Gadus macrocephalus: Pacific cod. Slightly different texture, milder flavor.
- Pollachius virens (saithe) or Merluccius (hake): sometimes marketed as "cod" in low-price formats. Inferior texture, lower price.
The label must specify the species. If it doesn't, the probability that it's not Gadus morhua is high.
2. The quality of the cod before desalting
A quality desalted loin starts with quality cured cod: caught in cold North Atlantic waters, from adult, good-sized specimens, cured for the appropriate time. Low-cost industrial desalting often starts with smaller cod, with faster curing or alternative species.
3. The industrial vs. artisanal desalting process
Industrial desalting is carried out in water tanks with controlled temperature and mechanical rotation, which speeds up the process but can affect the texture. Artisanal desalting—like what we do at Bacalalo—respects the cod's times: 24-36 hours in cold, with regular water changes, without shortcuts that compromise texture.
4. The final salt level
The salt level is the most difficult variable to control in industrial desalting because it depends on the size and thickness of each piece. A standardized process can leave some pieces over-desalted and others still with excess salt. Artisanal desalting allows for piece-by-piece adjustment.
5. The time between desalting and sale
Desalted cod has a limited shelf life: 3-5 days in proper refrigeration. On supermarket shelves, distribution and display time can compromise product freshness. In a specialized fishmonger, rotation is higher and the product is fresher.
How to recognize a quality desalted cod loin at the counter
By visual appearance
Color: pearly white or slightly yellowish white, homogeneous. A well-desalted loin should not have dark yellow areas (excess original curing) or gray spots (poor preservation).
Visual texture: the flakes should be visible, but the loin should have cohesion. A quality loin has a clear structure; it doesn't look like a uniform block or disintegrate.
Thickness: the best loins are at least 2-3 cm thick in the center. Very thin loins usually come from small cod or the peripheral parts of the fish.
Surface moisture: the loin should have moisture but should not be "swimming" in water. Excess surface water can indicate overly aggressive desalting or that the product has been on the counter for a long time.
By smell
A quality desalted loin smells:- Of clean sea
- With a subtle, not aggressive, cod note
- Without an ammoniacal smell (a sign of deterioration)
- Without a rancid or sour smell
By the label (if packaged)
- Species: Gadus morhua (always demand this)
- Origin: Norway, Iceland, or Faroe Islands (the best North Atlantic origins)
- Ingredients: cod and salt. Only these two.
- Packaging or best-before date: the fresher, the better for desalting.
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Desalted cod loins vs. Mercadona and other supermarkets: the real comparison
The search for "desalted cod loins Mercadona" is one of the most frequent on Google, which says a lot about the starting point of many buyers. To be direct:
Supermarket desalted cod loins have their advantages: affordable price, immediate availability, no preparation needed. For recipes where the cod is shredded or combined with intensely flavored ingredients (croquettes, fritters, industrial brandade), they can work.
Where the difference becomes evident:
- Pil-pil: you need cod with plenty of available collagen and a precise salt level. Low-cost loins often do not emulsify well.
- Confit and grilled: the texture of the loin becomes critical. A lower quality loin becomes dry and loses structure.
- Esqueixada and raw consumption: the flavor of the cod is the star. Quality differences are immediately noticeable.
The choice is yours, but it's important to know what is sacrificed with each decision.
Desalted cod loins at Bacalalo: artisanally desalted in Barcelona's Mercat del Ninot, with over 30 years of selecting only North Atlantic Gadus morhua. Ready to cook. See desalted loins in our store
Desalted cod formats and when to use each one
Whole loins (180-250g per piece)
The noblest part. Uniform thickness, impeccable presentation. For dishes where cod is the star: pil-pil, confit, baked, grilled, "a la llauna" style.
Medium loins or portions (100-150g)
Perfect for individual servings in restaurants or at home. The same quality as the whole loin in a more controlled format.
Contrabackalao or tail
The rear part of the loin, thinner and less uniform. Equally good texture but less regular presentation. Slightly more affordable price. For stews where appearance is less important.
Desalted belly (ventresca)
The belly of the cod, fattier and more gelatinous. Ideal for confits and recipes where richness is desired. It is not a "loin" in the strict sense but deserves mention.
Flakes and shredded desalted cod
Irregular pieces from different parts of the cod. They don't have the presentation of the loin but are perfect for brandade, croquettes, fritters, fillings, and rice dishes. Noticeably more affordable price.
How to cook desalted cod loins without ruining them
Temperature, key in everything
The biggest mistake with desalted cod is cooking it at too high a temperature. Cod is a lean fish with a low protein coagulation temperature (around 60°C). Above 70°C, proteins contract, collagen hardens, and the loin dries out.
Recommended temperatures:- Confit (the most perfect way): 55-60°C for 8-12 minutes
- Pil-pil: maximum 65°C in the oil during the first phase
- Grill: high heat 30-45 seconds per side (searing), then reduce
- Oven: 180°C maximum, 10-12 minutes for a 200g loin
Confit: the method that never fails
Confit in olive oil at a low temperature is the method that best preserves the texture and flavor of quality cod.
Process:- Dry the loin with kitchen paper (surface moisture can lower the oil temperature).
- Cover with olive oil in a saucepan or frying pan.
- Heat to 55-60°C (use a thermometer if you have one).
- Cook the loin for 8-12 minutes, depending on thickness.
- The oil should not bubble at any time.
Properly confited cod flakes perfectly and has a juiciness that no other method reproduces.
Frequently asked questions about desalted cod loins
1. How long does desalted cod last in the fridge?
3-5 days if well refrigerated (between 0°C and 4°C) and covered. After that time, the quality significantly declines.2. Can desalted cod be frozen?
Yes. Desalted cod freezes well. Freeze in individual portions, well-wrapped. Thaw in the refrigerator 12-24 hours before use. The texture may lose some firmness but is still perfectly valid.3. Why does supermarket desalted cod turn out dry?
It is usually due to a combination of inferior species, industrial desalting that damages the texture, and/or too high a cooking temperature at home.4. Is desalted cod already ready to eat?
Not in the sense of being regularly consumed raw. It is ready to cook without additional preparation, but it must be cooked before eating (except in specific preparations like esqueixada, where the cod is briefly "cooked" in lemon).5. How do I know if a desalted cod loin is Gadus morhua?
Ask at the fishmonger's or read the packaging label. The species should be listed. If it is not specified, ask directly.6. How much desalted cod do I need per person?
For a main course, 150-180g of desalted loin per person. For stews or rice dishes where cod shares the spotlight, 100-120g.7. Why doesn't pil-pil emulsify with supermarket cod?
Pil-pil requires available collagen in the cod. Lower quality loins (aggressive desalting, incorrect species) have less available collagen, which hinders emulsification. With quality cod and the correct process, pil-pil always emulsifies.8. Desalted cod or fresh cod for pil-pil?
For traditional pil-pil, always desalted cod. The salt-curing process modifies the cod's collagen in a way that facilitates the pil-pil emulsion. Fresh cod has less available collagen of that type.9. What is the difference between cod loin and belly?
The loin is the dorsal part, firmer and leaner. The belly (ventresca) is the belly, fattier and more gelatinous. For pil-pil and grilling, the loin. For rich confits and long-cooked stews, the belly.10. Can I make esqueixada with desalted cod?
Yes, it is the basis of esqueixada. Traditional Catalan esqueixada is made with desalted cod that is then "esmiqueña" (shredded by hand) and seasoned. It is not cooked.11. Is it worth paying more for a fishmonger's cod loin?
It depends on the recipe. For pil-pil, confit, and grilling, definitely yes: the difference in texture and flavor is considerable. For brandade, croquettes, or recipes where cod is mixed with other strong ingredients, the difference is less critical.12. How do you distinguish a middle loin from a tail loin?
The middle loin is thicker, more uniform, and rectangular. The tail loin is thinner, conical, and less regular. The middle loin is more expensive and gives better results for pil-pil and grilling.Conclusion
Desalted cod loins are the most in-demand product at our Mercat del Ninot store, and the reason is simple: they are the entry point to the world of quality cod for those who don't want to manage the desalting process but demand excellent results in the kitchen.
The difference between a quality loin and a supermarket one is not perception: it's about species, process, and care at every step. When you cook a Gadus morhua loin from the North Atlantic, artisanally desalted and at its exact point, the pil-pil emulsifies effortlessly, the grill sears perfectly, and the flakes separate without effort.
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