A Basque dish of hake fillets or steaks — often cut from the prized cogote (the meaty nape) — gently cooked in a pale-green sauce of olive oil, garlic, parsley, and white wine, thickened by the gelatine the fish itself releases. Clams and fresh peas are the classic garnish; green asparagus and hard-boiled egg appear in the fuller versions. The sauce is the point: glossy, lightly bound, and clinging rather than soupy. Salsa verde is counted as one of the four classical Basque mother sauces, alongside pil-pil (white), vizcaína (red), and the squid-ink tinta (black).
From the Basque Country (País Vasco) on Spain's northern Atlantic coast. The oldest documented record is a letter written in May 1723 by Plácida de Larrea, a Bilbao woman, describing hake stewed in an earthenware pan with abundant parsley, asparagus from Tudela, clams, and river crayfish — essentially the dish as it is still made. The attribution of the sauce to her traces to Luis Antonio de Vega's 1974 book Viaje por la cocina española, so it is better read as the earliest surviving description than a firm invention. The name 'merluza en salsa verde' itself appears in print in 1895, in a gastronomy volume by Félix Ibarguren, nicknamed Shishito, who opened the first cooking academy in San Sebastián. The richer variant, merluza a la koxkera, was developed in the early 20th century by San Sebastián cook José Gárate, who added fresh peas, green asparagus, and egg.
Flaky white hake in a pale-green, glossy sauce that has just enough body to coat the back of a spoon. The garlic-and-parsley aroma comes first; the clams add a briny pop and the peas a thread of sweetness. The sauce should cling to the fish and pool only lightly in the dish — a thin, broth-like sauce means the emulsion never formed. The fish stays moist and barely set, never dry or fibrous.
Like pil-pil, the sauce is an emulsion, and there is no flour in the classic restaurant version. Gentle heat draws collagen from the hake's skin and bones, which turns to gelatine and disperses into the olive oil, white wine, and the fish's own liquor; constantly swirling the cazuela (a shallow earthenware pan) keeps the fat suspended so the sauce thickens green and glossy rather than splitting. The heat is kept to a bare simmer — well below a hard boil — so the fish stays moist while the sauce binds. The clams open in the same pan and release their brine into the sauce, and the parsley goes in late so its colour and aroma stay fresh. Hake carries far less gelatine than cod, so its emulsion is looser and slower to form; for that reason many home cooks dust the fish in a little flour as insurance, which thickens the sauce by starch rather than by emulsion. Pil-pil works the same way but emulsifies oil with the heavier gelatine of cod (or its kokotxas) and is seasoned with garlic and dried chilli, never parsley — which is why it stays white.
Variations
The simplest version is hake with clams (almejas) and peas (guisantes) alone. Merluza a la koxkera — named for the koxkak, the cobblestones of San Sebastián's Old Town — is the fuller Basque version, adding hard-boiled egg, green asparagus, and clams to the peas. Cooks split between the flour-thickened home style and the pure-emulsion restaurant style. Other fish take the same sauce: monkfish (rape) and salt cod (bacalao) en salsa verde are both common.
On the Palate
Where Merluza en Salsa Verde sits in the Spanish flavor cloud
Ingredients
Serves 4
How it's made
8 steps · 20 min
- 120 min
Season hake fillets or steaks lightly with salt and set aside. Soak the clams in cold salted water for 20 minutes to purge sand.
- 25 min
Warm a generous layer of olive oil in a shallow earthenware cazuela (or wide pan) over low heat, then gently fry the finely sliced garlic until pale gold and fragrant — do not let it brown.
Watch outFry the sliced garlic only to pale gold and fragrant — let it brown and the whole green sauce turns bitter.
- 32 min
If using flour, stir a spoonful into the warm oil and cook briefly; otherwise skip straight on. Pour in the white wine and let it bubble for a minute to soften the alcohol.
- 42 min
Add a ladle of fish stock or water and swirl the pan in slow circles to begin emulsifying the oil into a pale sauce.
- 52 min
Lay the hake in skin-side down, scatter the clams around it, and keep swirling the pan — never stirring hard — so the gelatine the fish releases binds the sauce.
Watch outLay the hake skin-side down and keep swirling the pan, never stirring hard — the gelatine the fish releases is what binds the sauce green and glossy; stir and it splits.
- 68 min
Simmer gently for 6 to 8 minutes at a bare simmer, swirling often, until the fish is just set and the clams have opened. Discard any clam that stays shut.
Watch outKeep it at a bare simmer, well below a hard boil, for 6–8 minutes until the fish just sets and the clams open — discard any clam that stays shut.
- 72 min
Add the peas (and asparagus and egg for the koxkera version) to warm through in the last couple of minutes.
- 81 min
Shower with plenty of chopped parsley off or near the heat, swirl once more to fold in the colour, and serve straight from the cazuela.
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