Low-temperature confit: chef's technique explained
Low-temperature confit involves cooking cod submerged in oil at controlled temperatures between 60-75°C, well below the boiling point. At this temperature, the cod proteins gently denature without the flesh losing moisture, and the collagen transforms into gelatin, creating that "trembling" and silky texture characteristic of haute cuisine.
The technique is popular in Michelin-starred restaurants for its predictable and elegant results. Chefs like Berasategui, Arzak, and Aduriz have helped popularize low-temperature confit cod in modern Basque cuisine.
Exact temperature: 60°C, 65°C, or 70°C?
The ideal temperature depends on the desired result:
- 60°C (10-12 min): Very tender, translucent cod, almost semi-raw in the center. For advanced palates.
- 65°C (10-12 min): The optimal point for most. Perfectly cooked cod, juicy, flakes separate but connected.
- 70°C (8-10 min): Firmer, fully cooked cod. Safer for beginners.
- 75°C (6-8 min): Firm, traditional cod, similar to pan-fried but juicier.
Our recommendation: 65°C for 12 minutes for 180g of thick loin. This is the point that best balances silky texture and food safety.
Extra Desalted Clean Cod Loin - 900g
Direct selection of cod, verified quality.
Step-by-step preparation
Desalted Cod Loin with EVOO and Bay Leaf (1 pc) - 250g
Direct selection of cod, verified quality.
The oil: half the success
The oil is the cooking medium and also a key ingredient. Recommendations:
- Extra virgin olive oil: This is the traditional option. It provides a fruity flavor, antioxidants, and a stable temperature up to 100°C.
- Mild olive oil (refined): A more neutral option, it lets the cod's flavor shine. Better for purists.
- Reusable oil: The confit oil can be reused 3-4 times for confit other cod or to make mayonnaise, pil pils, or to drizzle over vegetables. Strain it and store it in a dark jar.
Never use sunflower oil or olive oil already used for frying: they will alter the taste of the cod.
No thermometer: tricks to get the temperature right
If you don't have a kitchen thermometer, you can get the temperature right with these visual tricks:
- Garlic test: Slice a clove of garlic. If, when submerged in the oil, it stays still and starts to release very small bubbles without moving, you're around 65°C. If it bubbles quickly or floats, it's too hot.
- Finger test (with caution): Place your finger 1 cm from the oil. At 65°C, you'll feel intense but not immediate heat. At 80°C, you'll need to withdraw it immediately.
- Visual test: Oil at 65°C is transparent and completely still. When it starts to show slow circular movements on the surface, it's approaching 80°C.
Even so, an investment of 12-15€ in a digital kitchen thermometer is the best guarantee. You'll amortize it with many techniques.
Variations: with piparras, in green oil, with romesco
The confit technique is the basis of many modern presentations:
Confit cod with piparras: Serve on a bed of piparras (sweet Basque chili peppers) in vinegar and boiled potato. A Gipuzkoan-inspired dish.
Confit cod with green oil: After confit, drizzle with a green oil made from cold-blended parsley and basil. Color and freshness.
Confit cod over romesco: A modern Catalan dish. The confit cod is served on a bed of warm romesco sauce. Confit + Catalan tradition.
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Conclusion: the technique that changes cod forever
Cooking cod at low temperature is not a haute cuisine whim: it is the best technically possible way to preserve the juiciness and silky texture of the product. Once you try confit at 65°C, it will be hard to go back to "traditional" pan-fried cod.
At Bacalalo, we work with clean, desalted cod loins, uniform caliber (180g), and boneless, ideal for confit. For 4 people, a kilo of loin is enough, and the leftover oil can be reused for 2-3 weeks for more confits or dressings.
Extra Desalted Clean Cod Loin - 900g
Direct selection of cod, verified quality.
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Frequently asked questions
Is it safe to cook fish at 65°C?
Yes, as long as the cod has been desalted or previously frozen (anisakis standard). At 65°C, bacteria are eliminated in a few minutes. Collagen gelatin begins to melt at 55°C.
How long does confit oil last in the fridge?
In a dark airtight jar, up to 3 weeks. If you strain it after each use, you can reuse it 3-4 times without loss of quality.
Can I confit cod in an adjustable deep fryer?
Yes, if the fryer goes down to 65°C (many do not, their minimum is 90°C). Check the range before using it.
Should the cod skin be removed before confit?
No. It's better to cook it with the skin: it protects the flesh from direct oil, maintains its shape, and provides extra collagen. The skin separates easily at the end.
Can a microwave be used to confit cod?
Some chefs experiment with microwaves at low power. We do not recommend it: the thermal distribution is irregular and the texture does not reach the same level.
Can I confit frozen cod directly?
Yes, but it extends the time to 18-20 minutes at 65°C and check the center with a thermometer: it should be at 60°C inside to ensure cooking.
Does confit work with cod loins or also with flakes?
Better with whole loins: flakes or shredded cod can fall apart in the oil. If using flakes, reduce the time to 6-8 min.
Why is the oil flavored if the aromatics are removed later?
So that the oil (and therefore the cod) absorbs the flavors. The whole aromatics are removed so they don't add bitterness during long cooking times. Some chefs leave them in for 2-3 minutes during confit to enhance the flavor.
