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Spanish · dinner

Kokotxas al Pil Pil — The Basque Emulsion Sauce That Comes From the Fish Itself

#spanish#basque#fish#seafood#hake

40m

Total time

4

Servings

415

kcal

hard

Difficulty

Jul 3, 2026

INGREDIENTS.

4
Fish
  • 800 g kokotxas (fresh hake throat/chin pieces)
Pantry
  • 180 ml extra-virgin olive oil, mild variety
  • to taste to taste fine sea salt
Produce
  • 6 clove garlic cloves
  • 1 small bunch flat-leaf parsley
Spice
  • 2 piece dried guindilla chilis

THE METHOD.

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0/10 done

FAQ · Things people ask

About this recipe.

What does 'pil pil' actually mean?

It is onomatopoeic — the sound of the oil gently simmering around the fish, 'pil pil pil'. The name describes exactly the heat level required: oil that is warm enough to cook the fish and release gelatin, but not hot enough to fry it.

I cannot find kokotxas at my fishmonger. What can I substitute?

The dish is technically only possible with kokotxas, because the gelatin in those specific cuts is what makes the sauce. The closest alternative is salt cod kokotxas (bacalao kokotxas), which is equally traditional and arguably more intense in flavour. If neither is available, some Basque cooks use skin-on hake belly pieces, which also carry significant gelatin — the sauce will be thinner but the principle is the same.

My sauce is not emulsifying — it looks like oily fish broth. What went wrong?

Most likely the temperature was too high or the fish cooked too fast before releasing gelatin. Let the pan cool off heat, then swirl with persistent circular motion for 3–5 minutes. If it still refuses to emulsify, strain the liquid into a bowl or jug and whisk briskly while pouring it back in a thin stream — this forces the emulsification manually, the same principle as saving a broken hollandaise.

Can I use salt cod instead of fresh hake?

Yes — bacalao kokotxas al pil pil is equally traditional and some argue the salt cod version has more depth from the curing. Desalt the bacalao kokotxas thoroughly (24–36 hours in cold water, changed three times) and pat very dry before cooking. The gelatin yield from salt cod kokotxas is slightly higher, making emulsification more reliable.

What is a txoko?

A txoko (or sociedad gastronómica) is a private gastronomic society unique to the Basque Country — members-only clubs where cooking is taken seriously as a competitive and social activity. They developed in the late 19th century and were originally men-only; most now admit women. Kokotxas al pil pil was refined and popularised in txoko kitchens and remains one of the benchmark dishes by which a Basque cook is judged.

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