Italian Potato and Salt Cod Ravioli with Brown Butter, Sage and Toasted Hazelnuts | Ravioli di Patate e Baccalà con Burro Nocciola, Salvia e Nocciole Tostate
Inside each of these ravioli is a filling that behaves like a mantecato and tastes like the northeast: salt cod softened in milk, beaten into potato with olive oil until it turns pale and glossy, seasoned with nothing more assertive than lemon and nutmeg. It is savoury without being salty, because the cod is drawn down for a day and a half before it goes near the potato.
Outside, three things and no sauce in the usual sense. Butter cooked until its milk solids toast and smell of roasted nuts, sage crisped in it, and hazelnuts cracked coarsely so they still crunch. A spoonful of pasta water turns that fat into something that clings. There is no cream, no stock and no tomato in the dish.
The pasta is a yolk rich dough rolled thin enough to read through, because a delicate filling is ruined by a thick wrapper. The balance of the plate rests on that: pale fish inside, dark toasted fat outside, the thinnest possible layer between them.
Yield: 4 servings, about 40 ravioli. Desalting: 36 hours. Prep: 1 hour 45 minutes. Rest: 1 hour. Cook: 45 minutes. Difficulty: advanced. Course: primo piatto. Region: Veneto and Friuli, the Alpine interior.
The Story
The northeast got its dried cod by accident. In 1432 a Venetian merchant captain, Pietro Querini, was wrecked off the Lofoten islands in Arctic Norway and spent the winter among fishermen who hung their catch on wooden racks until the wind freeze dried it hard as board. He took the product home, and within a century stoccafisso had become a Venetian staple. That is why baccalà alla vicentina is actually made with stockfish rather than salted cod, a confusion of names that has never been resolved.
Potato filled pasta is the other half of the ancestry and it belongs to the mountains. In Carnia, the alpine north of Friuli, cjalsons have been made for centuries with a potato base that swings between sweet and savoury from one valley to the next, dressed with melted butter and grated smoked ricotta. Further west, in Cadore, the same idea reappears as casunziei. These are cold country pastas: a starchy filling, a rich fat to dress it, and no need for a summer vegetable.
Browned butter with sage sits across all of it, from Trentino down to Emilia, and it is the oldest fat sauce in northern Italy. Hazelnuts are the outside element here, and they earn their place honestly: the Veneto grows them in the Cansiglio forest, Piedmont exports the finest in Europe, and their toasted flavour is the same flavour the butter develops when its solids caramelise. Putting the two together is not fusion, it is arithmetic.
Ingredients
For the pasta dough
Italian 00 flour, 1 3/4 cups (220 g)
Semola rimacinata, 1/4 cup (40 g)
Egg yolks, large, 6
Whole egg, large, 1
Extra virgin olive oil, 1 tsp (5 ml)
Fine sea salt, 1/2 tsp (3 g)
For the potato and salt cod filling
Dried salt cod, baccalà, thick loin, 9 oz (250 g) before soaking
Whole milk, 2 cups (480 ml)
Bay leaf, 1
Floury potatoes, 12 oz (340 g)
Garlic clove, peeled and left whole, 1
Extra virgin olive oil, 3 tbsp (45 ml)
Finely grated lemon zest, from 1/2 lemon
Flat leaf parsley, finely chopped, 1 tbsp (4 g)
Freshly grated nutmeg, 1 small pinch
Fine sea salt and white pepper, to taste
For the brown butter, sage and hazelnuts
Unsalted butter, 7 tbsp (100 g)
Fresh sage leaves, 16
Skinned hazelnuts, 1/3 cup (45 g)
Reserved pasta water, about 1/3 cup (80 ml)
For finishing
Smoked ricotta, ricotta affumicata, finely grated, 3/4 oz (20 g)
Finely grated lemon zest, from 1/4 lemon
Freshly ground black pepper, to taste
Preparation
Drawing the salt out of the cod
Set the loin on a small rack inside a deep bowl, skin side down, and cover it generously with cold water. The rack matters: salt leaving the fish sinks, and a piece resting on the base sits in the saltiest layer all night. Refrigerate 36 hours, changing the water every six hours. For a filling the target is lower than for a sauce, because the cod will be concentrated rather than diluted. Stop when a raw sliver tastes only faintly saline.
Poaching the cod in milk
Drain the loin, lay it in a small pan with the milk, the garlic and the bay leaf and bring it to 170°F (77°C) over low heat. Hold it there 10 minutes, never simmering, then take the pan off and let the fish cool in the milk 15 minutes. Milk is not decoration: its casein binds residual salt and its sugars round off the fish. Lift the cod out and keep 1/3 cup (80 ml) of the milk.
Cooking and drying the potatoes
Boil the potatoes whole in their skins until a skewer slides through, about 30 minutes, then drain and let them sit 5 minutes. Peel them while they are still too hot to hold comfortably and rice them into a wide bowl. Spread the riced potato out and leave it 10 minutes so the last steam escapes. A wet filling cannot be piped neatly and bursts a thin sheet from inside.
Beating the filling
Flake the cod, discarding skin and bone, and work it with the back of a wooden spoon while you pour the oil in slowly, as if making a mayonnaise. It goes pale and thick within three minutes. Fold in the riced potato, the reserved milk a spoonful at a time, the lemon zest, parsley and nutmeg. Season with white pepper and taste before adding any salt. Chill it and load a piping bag.
Mixing and resting the dough
Mound the flours together, make a well and add the yolks, whole egg, oil and salt. Bring the flour in from the walls with a fork, then knead 10 minutes until the dough is smooth and springs back slowly under a thumb. A yolk rich dough starts stiff and becomes supple only with time under your hands, so do not add water in the first five minutes. Wrap it and rest it 1 hour.
Rolling and filling the ravioli
Cut the dough in four and keep three pieces covered. Roll each down the machine to the second thinnest setting, until you can see your hand through the sheet. Pipe hazelnut sized mounds every inch and a half (4 cm) along one half, mist the sheet with water, fold the other half over and seal from the mound outward, pushing the air out. Cut with a wheel onto a semolina dusted tray.
Toasting the hazelnuts and browning the butter
Toast the hazelnuts in a dry pan over medium heat for 5 minutes, shaking often, until they smell sweet, then crush them under the flat of a knife so some pieces stay large. Melt the butter in a wide pan over medium heat and let it foam, hiss and go quiet. When the solids turn hazel brown and the smell turns nutty, drop in the sage, count to twenty and pull the pan off.
Boiling and dressing the ravioli
Bring 4 quarts (3.8 L) of water to a gentle boil and salt it lightly, 1 1/2 tbsp (27 g), because filling and cheese both carry salt. A rolling boil tears filled pasta, so keep it just short of that. Cook the ravioli 2 to 3 minutes, lift them with a spider into the butter pan with a few spoonfuls of the water, and swirl over low heat for 30 seconds until butter and water come together and coat every piece.
Plating
Use flat plates rather than bowls, warmed to about 140°F (60°C), and lay the ravioli in a single layer, eight or ten per portion, slightly overlapping. Stacked filled pasta steams itself and the sheets stick together, which is the one thing that undoes an hour of rolling.
Spoon the pan butter over them so it pools around rather than on top, then arrange the crisp sage leaves and scatter the crushed hazelnuts across the plate, keeping a few of the larger pieces visible. Finish with a light dusting of smoked ricotta, a little lemon zest and a turn of black pepper. The smoked ricotta is there for its faint woodsmoke and its salt, so a dusting is enough: too much and it covers the cod entirely. Serve immediately, because brown butter is at its best for about ninety seconds.
Professional Technique
The filling is made by the mantecatura method, the same one used for baccalà mantecato in Venice. Cod poached gently holds a large quantity of water and dissolved collagen in its fibres. Beating it while adding oil drop by drop forces that water into suspension in the fat, producing a genuine emulsion, white, thick and stable. Add the oil too fast, or beat cod that is fridge cold, and it never forms: you get oily shreds and a filling that weeps inside the pasta.
Browning butter is a controlled Maillard reaction and it has a narrow window. Butter is roughly sixteen per cent water and two per cent milk solids, and nothing happens until the water has boiled off. The noise tells you where you are: loud spitting means water is still leaving, silence means it has gone and the solids are now frying. From silence to hazel brown is about forty seconds, and from hazel brown to acrid black is about twenty more. The sage goes in at the silence, both because it crisps in clarified fat and because the leaves drop the temperature enough to slow the browning down.
Texture and Moisture Control
A ravioli filling has to be firm enough to pipe and soft enough to eat, and potato is what makes that possible. Boiling the potatoes whole in their skins keeps water out of the flesh, and ricing them hot lets steam escape instead of condensing. If it still looks slack, spread it on a tray and refrigerate it uncovered twenty minutes rather than adding breadcrumbs, which dull the flavour. It should hold a peak on a spoon.
The pasta wants the opposite control. A yolk dough is low in water to begin with and dries fast, so sheets are rolled one at a time and the rest stay wrapped. Mist the sheet before folding rather than brushing it wet, because a soaked seam turns slippery and refuses to bond. Push the air out from the mound outward as you seal: a trapped bubble expands in boiling water and splits the ravioli. Finally, the pasta water is the only thing that turns brown butter into a sauce. Butter alone slides off; butter with a few spoonfuls of starchy water, swirled off the heat, emulsifies into something that clings to every edge.
Professional Mise en Place
The filling and the ravioli are day before work. Only the butter and the boiling happen to order, and both are fast enough to go wrong if anything else is still unfinished.
Equipment and tools
Rack and deep bowl for desalting, and a small pan for the milk poach
Potato ricer and a wide bowl for beating the filling
Pasta machine, wheel cutter and semolina dusted trays
Piping bag, wide sauté pan for the butter, spider skimmer
Prepared ahead
Salt cod desalted, 36 hours ahead, water changed every six hours
Filling beaten and chilled, up to 2 days ahead, in a piping bag
Dough made and rested, up to 1 day ahead, wrapped and refrigerated
Hazelnuts toasted and crushed, up to 2 days ahead, kept airtight
Service setup
Ravioli on semolina dusted trays, uncovered, or frozen solid
Water at a gentle boil, salted lightly, spider beside it
Butter, sage and a cup for pasta water within reach of the pan
Plates warmed, smoked ricotta grated, lemon ready to zest
Chef Tips
Bring the poached cod to room temperature before you beat it. Cold flesh will not take up oil and the emulsion simply refuses to form, which is the single most common reason a mantecato fails. Twenty minutes on the counter costs nothing and changes everything.
Buy hazelnuts in their skins and toast them yourself if you have the choice. Preskinned nuts have usually been roasted once already and go bitter on a second pass. If yours have skins, rub them in a tea towel while warm and accept that some skin stays behind.
Make the filling two days ahead. It tightens in the refrigerator, which makes it far easier to pipe, and the lemon and nutmeg settle into the cod instead of sitting on top of it. Taste it again cold before you fill anything, since chilling mutes salt.
Freeze the ravioli if you are making them in advance. Spread them apart on a semolina dusted tray, freeze them solid, then bag them. They cook from frozen in about 4 minutes and hold their shape better than ones that have sat in a refrigerator absorbing moisture.
Common Mistakes
Underdesalting the cod. A filling concentrates flavour rather than spreading it through a sauce, so cod that passes in a stew is punishing inside pasta. Thirty six hours with the water changed every six is the baseline, and the sliver you taste should be barely saline.
Adding the oil too quickly. The filling is an emulsion and it breaks exactly the way mayonnaise does. Pour the oil in a thin stream while beating, and if it splits, start again with a spoonful of warm cod and work the broken mixture back into it a little at a time.
Rolling the pasta too thick. A robust sheet overwhelms a delicate filling and makes the ravioli taste of flour. Take it to the second thinnest setting, until the shadow of your hand shows through. If it tears there, the dough needed longer kneading, not more flour.
Trapping air in the ravioli. An air pocket expands in the boiling water and bursts the seam, which sends the filling into the pot. Seal from the mound outward, pressing the air toward the open edge, and check each piece before cutting.
Taking the butter past hazel brown. The solids go from nutty to acrid in about twenty seconds and there is no recovery. Watch for the foam to subside and the noise to stop, then judge by colour and smell and pull the pan off while it is lighter than you think it should be.
Wine Pairing
Roero Arneis DOCG: Grown in the sandy Roero hills within sight of Piedmont's hazelnut groves, which is reason enough to start here. Arneis is dry, medium bodied and low in acidity for a white, with pear and a nutty, almost bitter almond finish that lines up with the toasted hazelnuts rather than cutting across them.
Soave Superiore DOCG: Garganega from the volcanic hills east of Verona, and the Veneto answer to a Veneto filling. It has a waxy texture that matches the mantecato and a saline finish that keeps the browned butter from feeling heavy. Take a Superiore rather than a basic Soave: the extra concentration is needed.
Verdicchio dei Castelli di Jesi Classico Riserva DOCG: The Riserva spends longer on its lees and gains a creamy weight that ordinary Verdicchio lacks, while keeping the firm acidity and the bitter almond signature of the grape. That combination is unusually good with salt cod, which needs both fat to sit beside and acidity to be lifted by.
Collio Friulano DOC: From the hills on the Slovenian border, and the geographic partner to the Carnia pasta tradition behind this dish. Friulano is dry and broad with a pronounced bitter almond note and a herbal edge that follows the crisped sage. Its texture is generous enough for butter without needing oak.
Alta Langa DOCG: The Piedmontese metodo classico, aged at least thirty months on the lees, and the choice when the plate should be cut rather than matched. Its fine bead and high acidity scour the palate between forkfuls of butter, while the long lees ageing gives a toasted bread character that echoes the browned milk solids.
Storage & Reheating
The filling keeps in an airtight container in the refrigerator for 2 days and is better on the second, once the lemon and nutmeg have settled into the cod. The dough keeps 1 day wrapped tightly, though it darkens slightly at the surface and should be cut away before rolling. Toasted hazelnuts keep 2 days in a sealed jar and go soft after that.
Uncooked ravioli should be frozen rather than refrigerated. Spread apart on a semolina dusted tray, frozen solid for 2 hours and then bagged, they keep 1 month and cook straight from frozen in about 4 minutes. Left in the refrigerator overnight instead they absorb moisture from the filling and the base of each one turns translucent and sticks to the tray.
Cooked ravioli do not reheat well in water, which waterlogs the sheet. Warm leftovers in a nonstick pan with a knob of fresh butter over low heat for 2 to 3 minutes, turning once, and add a spoonful of water to loosen. Do not reuse yesterday's browned butter, which has already gone as far as it can go and turns bitter on a second heating. Brown a fresh knob instead, it takes two minutes.
Nutrition
Per serving, based on 4 servings of about ten ravioli each:
Calories: 760 kcal
Total Fat: 42 g
Saturated Fat: 19 g
Trans Fat: 0.8 g
Unsaturated Fat: 21 g
Cholesterol: 345 mg
Sodium: 890 mg
Total Carbohydrates: 62 g
Fiber: 4 g
Total Sugars: 4 g
Added Sugars: 0 g
Protein: 35 g
Lactose: 2.2 g
Principal micronutrients: vitamin B12, selenium, iodine, vitamin E, phosphorus, choline
These figures are estimates. Cholesterol is high because of the yolk rich dough, and sodium depends on how far the cod was drawn down. Allergens: fish, milk, egg, tree nuts and gluten.
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