Bacalao al Pil-Pil (Basque Cod in Garlic Emulsion)

About This Recipe

Bacalao al pil-pil is the great party trick of Basque cooking — a dish whose entire mystique rests on a technique. Salt cod (bacalao) loins are gently warmed in olive oil with sliced garlic and dried chili at a temperature so low the fish never actually cooks; instead it releases its skin gelatin into the oil. The pan is then taken off the heat and shaken — slowly, then more vigorously — in a swirling figure-eight motion until the fish gelatin and olive oil emulsify into a thick, pale-gold sauce that looks impossibly creamy with no dairy and no flour involved. The 'pil-pil' name is onomatopoeic, mimicking the sound of the oil bubbling. The dish originated in Bilbao taverns in the 19th century and remains one of the genuinely magical preparations of the Spanish kitchen — equal parts physics, technique, and humble salt fish.

Ingredients

Serves 4

• 800 gskin-on salt cod loins (bacalao desalado), in 4 pieces of 200 g each
• 400 mlgood extra-virgin olive oil (Spanish arbequina or empeltre preferred)
• 8 clovesgarlic, thinly sliced lengthwise
• 2dried guindilla peppers (or substitute 2 small dried red chilies)
• 1 tbspflat-leaf parsley, chopped (to finish)

Instructions

1. 1

   Desalt the cod (if needed)

   If your bacalao is bone-dry salted, soak it 36–48 hours in plenty of cold water in the fridge, changing the water 4 times. If you bought it pre-desalted (desalado), proceed straight to the cooking. Pat the loins very dry before cooking — water on the skin will break the emulsion.

   Skin-on cod is essential — the skin's collagen is the entire source of the pil-pil emulsion.

2. 2

   Infuse the oil

   In a wide heavy skillet (cast iron or enameled cast iron is ideal), warm the olive oil over low heat. Add the sliced garlic and the dried chilies. Cook very gently 5–6 minutes until the garlic is pale gold — not brown. Lift the garlic and chili out onto paper towels and reserve. Let the oil cool until you can hold a finger in it (about 60°C / 140°F).

   The oil must be cool enough that the cod doesn't actually fry — only confit in warm oil.

3. 3

   Confit the cod

   Place the cod loins skin-side down in the cool oil. The oil should come halfway up the fish. Set over the lowest possible heat for 8–10 minutes — tiny bubbles should rise from the skin, no more. The fish should turn opaque and barely flake.

   If the oil simmers actively, you're cooking it too hot; the dish will not emulsify. Keep oil temperature in the 65–80°C range.

4. 4

   Lift the fish

   Carefully transfer the cod to a warm plate and tent loosely. The skin will have shed gelatin into the oil — you may see whitish drops at the bottom of the pan. That is the emulsifier.

5. 5

   Start the emulsion

   Off the heat, let the oil cool another 1–2 minutes — it should not be smoking-hot. Then gently swirl the pan in slow circles. You should start to see the oil thicken at the edges and turn pale.

   This is the magic step. Some cooks use a fine sieve in a figure-eight pattern through the oil to help — the sieve introduces tiny air bubbles that accelerate emulsification.

6. 6

   Build the pil-pil

   Swirl harder, in larger figure-eight motions, for 2–3 minutes. The oil will gradually emulsify into a pale, creamy, thickened sauce — about the consistency of hollandaise. If it stalls, return briefly to the lowest heat for 30 seconds and resume swirling.

7. 7

   Return cod and serve

   Slide the cod loins back into the emulsified sauce, skin-side up. Spoon some pil-pil over each piece. Scatter the reserved garlic chips, chili rings, and parsley. Serve immediately in the pan, with crusty bread to mop up.

Variations

• •

  Bacalao a la Vizcaína: the other great Basque cod preparation, with a sauce of dried chorricero peppers, onion, and tomato instead of the pil-pil emulsion.

• •

  Pil-pil with prawns: add 8 head-on prawns to the warm oil to flavor it before cooking the cod, then arrange on top to serve.

• •

  Fresh-cod pil-pil: a modern variation using fresh cod loins; you lose the desalado flavor but the emulsion still works if the skin is on.

Storage

Bacalao al pil-pil is a serve-immediately dish — the emulsion breaks within 30 minutes off the heat. Refrigerated leftovers will not reheat with the sauce intact; eat any leftover cod cold flaked into a salad.

Frequently Asked Questions