Bacalhau à Lagareiro: Portuguese Olive-Oil-Roasted Cod Where the Oil Is the Whole Dish

There is a reason this Portuguese classic is named after the lagareiro — the keeper of the olive press. In bacalhau à lagareiro, olive oil is not a cooking fat quietly doing its job in the background. It is the dish. The roasted cod and the smashed potatoes are there to carry it. Which means the whole plate lives or dies by the bottle you reach for: pour over a flat, blended supermarket oil and that is precisely how it will taste — thin and forgettable. Pour over a proper hand-harvested Greek extra virgin and it becomes the kind of dinner people go quiet over. Reach for our Peloponnese olive oil and you are already most of the way to the real thing.

Below you will find the authentic method, an easy shopping list, and the small details that separate a good à lagareiro from one you will want to cook every week through autumn.

What Is Bacalhau à Lagareiro?

Bacalhau à lagareiro is one of Portugal's most beloved ways with cod. The fish is roasted until just flaking, then crushed potatoes — the famous batatas a murro, literally "punched potatoes" — are smashed open beside it, the whole tray is scattered with sweet, golden garlic, and then everything is bathed in a generous, almost extravagant amount of warm olive oil. "À lagareiro" means "in the style of the olive-oil maker", and the name is a promise: this is a dish built to show off great oil.

Traditionally it is made with salt cod, soaked for a day or two to rehydrate and gently de-salt. That is wonderful if you plan ahead — but a thick fresh cod loin works beautifully too and turns this into a realistic weeknight dinner. Either way, the technique and the soul of the dish stay exactly the same.

Why the Olive Oil Decides Everything

Here is the honest truth most recipes skip: because the oil in à lagareiro is poured over at the end and barely cooked, there is nowhere for a mediocre one to hide. Every nuance lands directly on your palate. A dull oil tastes greasy. A great one tastes alive.

Our extra virgin olive oil from the Peloponnese is built for exactly this moment. It is hand-harvested and made by cold mechanical extraction, so it keeps its character. It is naturally cloudy and unfiltered, which is where that full, fruity body comes from. It is lab-tested: low in acidity, rich in polyphenols, with no mineral oil residues detected — and those polyphenols are the source of the gentle peppery catch at the back of the throat that marks a genuinely fresh oil. Because it is heat-stable up to 180°C without forming trans fats, the same bottle you drizzle at the table is the one you roast the potatoes in. One oil, start to finish.

Ingredients (Serves 4)

Everything here is simple — which is exactly why quality matters.

• 4 thick cod loin pieces (about 180 g each), or 600 g salt cod soaked for 24–48 hours
• 800 g small waxy potatoes
• 1 whole head of garlic, cloves separated, skins on
• 150 ml extra virgin Peloponnese olive oil — yes, that much; it is the point
• 2 bay leaves
• A handful of black Kalamata olives (optional, but traditional and delicious)
• Fresh flat-leaf parsley, roughly chopped
• Sea salt and freshly cracked black pepper

The one ingredient you cannot compromise on is the oil. Get the good one here before you start.

How to Make Bacalhau à Lagareiro (Step by Step)

1. Boil the potatoes. Simmer the whole, unpeeled potatoes in well-salted water until tender, about 20 minutes. Drain and let them steam dry.
2. Smash them. Place the potatoes on an oven tray and press each one with your palm or the base of a glass until it bursts open but holds together. Those craggy edges are what soak up the oil.
3. Confit the garlic. Nestle the skin-on garlic cloves and bay leaves among the potatoes. Pour over half the olive oil, season well, and roast at 180°C for 25–30 minutes, until the potatoes are golden and the garlic is soft and sweet.
4. Add the cod. Pat the cod dry, season, and lay it on top of the potatoes. Roast for a further 12–15 minutes, just until the fish turns opaque and flakes at a gentle nudge. Do not overcook it.
5. The lagareiro moment. Take the tray out and pour the remaining cold, raw olive oil generously over the fish and potatoes. This final, uncooked drizzle is the whole dish — do not hold back.
6. Finish and serve. Scatter over the Kalamata olives and parsley, squeeze the soft garlic from its skins, and bring the tray straight to the table.

Tasting as you go? Keep the bottle close — this is the oil that makes the final drizzle sing.

Tips from the Olive Press

Warm the finishing oil very gently. A few seconds of warmth (not frying) opens up the aroma without cooking away the fresh polyphenols. Serve it generously saucy. The pool of garlicky oil at the bottom of the tray is not a mistake — it is the best part, perfect for mopping up with rustic bread. Choose cod that is thick. A chunky loin stays juicy where a thin fillet dries out.

Frequently Asked Questions

Can I use fresh cod instead of salt cod?
Absolutely. Traditional à lagareiro uses soaked salt cod, but a thick fresh cod loin is more forgiving and perfect for a weeknight. Just season well and watch it closely so it stays juicy.

Why does the recipe use so much olive oil?
Because the dish is named after the olive-oil maker. The oil is the star, not a background fat — so its quality is tasted directly. A fresh, polyphenol-rich extra virgin like our Peloponnese oil is what turns the dish from good to unforgettable.

Can I roast and finish with the same olive oil?
Yes. Our Peloponnese extra virgin is heat-stable up to 180°C without forming trans fats, so you can roast the potatoes and give the final raw drizzle from the very same bottle.

Great cod, sweet garlic and crushed potatoes give you the shape of this dish — but it is the oil that gives it a soul. Pour something honest, fresh and alive, and bacalhau à lagareiro becomes the taste of the Mediterranean in your own kitchen. Secure your bottle of Peloponnese olive oil now and taste the difference — Pour La Vie.