Summary
Cod in green sauce is one of the great dishes of Spanish cuisine. An emulsion of olive oil, garlic, parsley, and fish broth that thickens on its own thanks to the gelatin released by the cod. In this guide: Green sauce: the most elegant in cod cuisine, Ingredients for 4 people, Step-by-step preparation.
Green sauce: the most elegant in cod cuisine
Cod in green sauce is one of the great dishes of Spanish cuisine. An emulsion of olive oil, garlic, parsley, and fish broth that thickens on its own thanks to the gelatin released by the cod. It's a sauce that looks difficult, but it isn't. It just needs low heat, patience, and good wrist movement.
It's a dish of Basque origin that has spread throughout Spain. In the Basque Country, it's called "bacalao en salsa verde" (cod in green sauce) or "merluza en salsa verde" (hake in green sauce). In Basque restaurants, the sauce is thickened by moving the casserole in circles, without a spoon. At home, you can use a fork. The result is the same: a silky, green, shiny sauce that envelops the cod like a cloak.
It's a perfect dish for Easter. It has presence, can be prepared in 25 minutes, and combines cod with clams, which open in the same sauce and add a touch of the sea.
Ingredients for 4 people
- 4 desalted cod loins (180-200 g each, thick)
- 300 g fresh clams (optional but recommended)
- 6 cloves of garlic
- 1 large bunch fresh parsley
- 1 tablespoon flour
- 150 ml dry white wine
- 200 ml fish broth (or fumet)
- 100 ml extra virgin olive oil
- 1 dried chili (optional)
- Salt
For the clams: soak them in cold salted water (1 tablespoon salt per liter) for 1-2 hours before cooking. This purges them and removes sand.
Step-by-step preparation
1. Prepare the ingredients (10 minutes)
Slice the garlic thinly. Chop the parsley: separate the stems from the leaves. Reserve the stems for the broth and finely chop the leaves for the sauce.
Pat the cod loins dry with kitchen paper. If they have skin, place them skin-side down in the casserole (we'll turn them over at the end).
2. Brown the garlic and make the base (5 minutes)
In a wide, shallow casserole (earthenware or cast iron), heat the olive oil over medium heat. Add the sliced garlic and the chili (if using). Cook for 1-2 minutes, stirring until the garlic begins to lightly brown. Don't burn it.
Add the flour, stir for 30 seconds. Pour in the white wine and let the alcohol evaporate for 1 minute over high heat.
3. Add the broth and parsley (2 minutes)
Lower the heat to medium-low. Pour in the fish broth. Add half of the chopped parsley and the stems. Stir and let it come to a gentle boil.
4. Cook the cod (10-12 minutes)
Place the cod loins in the casserole skin-side up. The liquid should cover half of the loin, not all of it. If it covers too much, remove some.
Now for the trick: move the casserole in gentle circles, without lifting the loins from the bottom, throughout the cooking time. This constant movement causes the cod's gelatin to mix with the oil and broth, creating the emulsion that is the green sauce.
Cook for 10-12 minutes over low heat. After 8 minutes, carefully flip the loins (now skin-side down). Continue moving the casserole.
5. The clams (3-4 minutes)
After 10 minutes of cod cooking, add the purged clams around the loins. Cover the casserole and raise the heat slightly. The clams will open in 3-4 minutes. Discard any that don't open.
6. Finish the sauce
Remove the casserole from the heat. Sprinkle with the remaining fresh chopped parsley. The sauce should have a semi-liquid, bright green, and slightly thick consistency. If it's too runny, place the casserole over high heat for 1-2 minutes, moving it in circles to reduce and emulsify.
Serve in the same casserole or divide into deep plates, with a generous amount of sauce and the open clams around it.
Tips for a perfect green sauce
- Low heat, always. If the heat is too high, the cod's gelatin doesn't have time to emulsify with the oil. The result is a watery sauce instead of creamy. Patience.
- Move the casserole, not the cod. Use the circular motion of the casserole, not a spoon. If you stir with a spoon, you break the loins and the sauce becomes cloudy. The circular rocking motion mixes the sauce without touching the fish.
- Flour is a safeguard. Basque purists don't use it: they thicken the sauce only with the cod's gelatin. But a tablespoon of flour ensures that the sauce will thicken even if the loins don't release enough gelatin. For the first few times, use it.
- Fresh parsley, never dried. Dried parsley doesn't have the necessary color or flavor. A bunch of fresh parsley costs 50 cents and makes all the difference.
- Homemade or quality fish broth. Concentrated bouillon cubes add salt but little flavor. If you can, make a quick fumet with fish heads, onion, and bay leaf (20 minutes). Otherwise, buy a good brand of fish broth.
What to serve with cod in green sauce
Cod in green sauce is a dish that calls for bread. Lots of bread. The sauce is the best part of the dish, and you have to dip.
- Rustic bread: essential. A loaf, sourdough, or a Galician baguette. Cut thick for dipping.
- White rice: an alternative to soak up the sauce. Place a bed of rice on the plate and put the cod on top.
- Boiled potatoes: cut into thick slices, they are the classic Basque accompaniment. Boil them separately and add them to the casserole for the last 3 minutes.
- Green asparagus: sautéed for 2 minutes in a pan, served alongside the cod. They add color and freshness.
For a complete Easter meal, start with a Lenten stew as a first course, this cod in green sauce as a main, and torrijas for dessert.
Premium Seafood Products — Bacalalo
Since 1990, selecting the best from the sea at Mercat del Ninot, Barcelona. Refrigerated delivery in 24-48h.
View desalted cod →🛒 Products mentioned in this article
⭐ 4.9/5 · Refrigerated delivery 24-48h · Since 1990 at Mercat del Ninot
Frequently asked questions about cod in green sauce
Can I make it without clams?
Yes. Clams are a complement, not the main ingredient. Without them, the dish is still a complete cod in green sauce. If you want to add something, try fresh peas or sliced wild asparagus.
Why isn't my sauce thickening?
Three common causes: heat too high (gelatin doesn't emulsify), lack of circular movement (emulsion doesn't form), or loins too thin (release little gelatin). If the sauce is still watery at the end of cooking, remove the cod and reduce the sauce over high heat, moving the casserole for 2-3 minutes.
Can I prepare it in advance?
You can prepare the base (browned garlic, wine, broth, and parsley) in advance. But cook the cod and clams just before serving. Cod gets overcooked if reheated, and clams shrink.
Does it work with hake instead of cod?
Yes. Hake in green sauce is another Basque classic. Use thick hake slices and reduce cooking time to 8-10 minutes. Hake releases less gelatin, so use the tablespoon of flour.
What white wine should I use for the sauce?
A dry and young white wine. Txakoli is the Basque classic. A Verdejo from Rueda or an Albariño works perfectly. Avoid sweet or very aromatic wines that compete with the parsley flavor.
Why is it called "green sauce" if it's more yellowish?
The name comes from the parsley. If you use enough fresh parsley and add it in two stages (halfway through cooking and at the end), the sauce will be green. If you only add it at the beginning, the color is lost with the heat. The second addition of parsley at the end is what gives it the vibrant green color.
Discover more
