Italian Piedmont Gianduja Cake | Torta di Gianduia Piemontese
Updated: Sep 14
A gianduja cake is a chocolate cake in which a substantial part of the fat has been quietly replaced. Butter and cocoa butter are both solid at room temperature and both contribute to a crumb that firms as it cools. Hazelnut is different: roughly 60 percent of its weight is oil, that oil is overwhelmingly oleic, and it stays liquid at every temperature this cake will ever be served at. Put ground hazelnuts and gianduja into the batter and close to two fifths of the fat in the finished crumb never sets at all.
That is what makes the cake worth baking and it is also what makes it difficult to judge. The crumb stays moist for days because a permanently liquid fat cannot dry out the way a butter crumb does. The set point of the whole structure drops, so the cake is softer to the touch and slower to firm. And a skewer pushed into the centre of a perfectly baked one comes out carrying an oily smear that looks exactly like raw batter, which is why so many of these cakes get returned to the oven and ruined.
The recipe below is the Piedmontese version: dark chocolate and gianduja together, toasted hazelnuts ground into the batter alongside a small measure of flour and cocoa, whites folded through for lift, and a gianduja crémeux, a raspberry compote and a thin hazelnut praline to finish the plate. The method is built around a thermometer rather than a skewer, and around the understanding that most of the setting happens after the oven, not in it.
Yield: 10 slices from an 8 inch (20 cm) round pan. Prep: 50 minutes. Bake: 35 to 40 minutes. Cool and set: 3 hours. Total: about 5 hours. Difficulty: intermediate. Course: dolce. Region: Piedmont, Alba and the Langhe.
The Story
Gianduja began in Turin as a way of stretching scarce cocoa with local hazelnuts under the Napoleonic blockade, which is the one line this cake needs of that history. What happened next is more relevant. The hazelnut and cocoa pairing moved out of the confectioner's shop and into the pastry kitchen, and by the late nineteenth century every decent pasticceria between Turin and Alba had a cake built on it, sold by weight, cut from a round tin and eaten in the afternoon rather than after dinner.
Piedmont could do this because it had both halves of the equation on its own doorstep. The hazelnut groves of the Alta Langa and the hills around Cortemilia supplied nuts of a quality that the rest of Italy simply bought in, and Turin had been the centre of Italian chocolate manufacture since the seventeenth century, when the Savoy court took up the drink and the city acquired the machinery and the trade guilds that went with it. A cake needing large quantities of both good chocolate and good hazelnuts could be an everyday product in Piedmont and nowhere else.
The domestic versions and the pastry shop versions diverged over time. Home bakers tended towards a plainer round cake, often with nothing on it but a dusting of icing sugar, meant to sit under a cloth on the sideboard for several days. The shops layered it, glazed it and gave it crémeux and praline. This recipe sits with the second tradition but keeps the first one honest: the cake itself is complete and worth eating on its own, and the garnishes are there to give the plate contrast rather than to prop up a cake that cannot stand alone.
Ingredients
For the cake
Shelled hazelnuts, 1 cup (125 g)
Dark chocolate, 70 percent cocoa, finely chopped, 4 oz (115 g)
Gianduja chocolate, finely chopped, 4 oz (115 g)
Unsalted butter, 8 tbsp (113 g)
Granulated sugar, 1/2 cup (100 g), divided
Large eggs, separated, 4
All purpose flour, 1/3 cup (40 g)
Unsweetened cocoa powder, 2 tbsp (15 g)
Vanilla extract, 1 tsp (5 ml)
Kosher salt, 1/4 tsp (1.5 g)
For the gianduja crémeux
Gianduja chocolate, chopped, 4 oz (115 g)
Whole milk, 1/2 cup (120 ml)
Heavy cream, 1/2 cup (120 ml)
Large egg yolks, 3
Granulated sugar, 1 tbsp (12 g)
Fine sea salt, 1 small pinch
For the raspberry compote
Fresh or frozen raspberries, 1 1/2 cups (185 g)
Granulated sugar, 2 tbsp (25 g)
Lemon juice, 1 tbsp (15 ml)
Cornstarch, 1 tsp (3 g), slaked in 2 tsp (10 ml) cold water
For the hazelnut praline
Toasted hazelnuts, 1/2 cup (65 g)
Granulated sugar, 1/3 cup (70 g)
Water, 1 tbsp (15 ml)
Fine sea salt, 1 small pinch
For finishing
Unsweetened cocoa powder, for dusting
Flaky sea salt, a small pinch for each quenelle
Preparation
Toast the hazelnuts and grind them short
Heat the oven to 325°F (163°C). Spread all the hazelnuts, both the cup for the batter and the half cup for the praline, on one tray and toast for 8 to 10 minutes until fragrant and pale gold under the skins. Rub them in a towel to loosen most of the skins, then cool them completely before grinding. Warm nuts turn to paste in a processor within seconds. Pulse the batter portion in short bursts to a coarse meal with visible grain, stopping while some pieces are still the size of coarse sand, and keep the praline portion whole.
Melt the two chocolates with the butter
Combine the chopped 70 percent chocolate, the gianduja and the butter in a bowl set over barely simmering water and stir occasionally until smooth. Take it off the heat when it reaches about 110°F (43°C) and let it come down to 95°F (35°C) before it meets the yolks. This is the first place the recipe can go wrong. Gianduja carries hazelnut oil as well as cocoa butter, and a mixture poured in too hot will start cooking the yolks and thinning the batter beyond recovery.
Build the yolk base
Whisk the yolks with half the sugar, 1/4 cup (50 g), until they thicken slightly and lighten to the colour of pale butter, about 2 minutes by hand. Fold in the cooled chocolate and butter mixture, then the vanilla and the salt. The base will look glossy and surprisingly loose compared with a conventional chocolate cake batter, and that is correct, because a good share of its fat is liquid oil that will never thicken.
Fold in the dry ingredients
Sift the flour and cocoa together, add the ground hazelnuts, and stir them once so the meal is evenly dispersed through the powders. Fold this into the chocolate base in two additions with a wide spatula, stopping the moment no dry pockets remain. The flour here is only 1/3 cup (40 g) against 1 cup (125 g) of nuts, so there is very little gluten available to toughen, but overworking still knocks out the small amount of air already in the yolks.
Whip the whites to glossy medium peaks
Whip the egg whites in a scrupulously clean bowl until they turn opaque and begin to hold a shape, then add the remaining 1/4 cup (50 g) of sugar in a slow stream and continue to medium peaks: glossy, smooth, and slumping gently at the tip when the whisk is lifted. Stop there. Stiff dry whites will not disperse into a batter this heavy and will leave white streaks and tunnels through the baked crumb.
Fold the whites in three additions
Stir a third of the whites into the batter without ceremony to loosen it, then fold the second and third additions in properly, cutting down through the centre and sweeping up the side of the bowl. Work quickly. The batter is dense and fatty and it deflates whites faster than a lean sponge batter would, so the last addition should be folded only until the streaks disappear and not one turn further.
Bake at 350°F (175°C) and pull by temperature
Butter an 8 inch (20 cm) pan, line the base with parchment, and butter the parchment as well. Pour in the batter, level the top, and bake at 350°F (175°C) for 35 to 40 minutes. Ignore the skewer. Push a probe thermometer into the centre at an angle and pull the cake when it reads 200 to 203°F (93 to 95°C). The edges will look set and matte, the centre will still be slightly darker and will give under a fingertip, and a crack or two across the top is normal and not a fault.
Cool completely in the pan
Set the pan on a rack and leave it alone for at least 2 hours, and preferably 3. This is not a resting instruction, it is part of the bake. Almost all of the structure this cake will ever have arrives while it is cooling, as the cocoa butter and the butter recrystallise somewhere below 80°F (27°C) and lock the crumb together. Turn it out warm and the centre will sink and smear. Turn it out cold and it comes away clean.
Cook the crémeux to 180°F (82°C)
Warm the milk and cream in a small pan. Whisk the yolks with the sugar, temper them with a ladle of the hot liquid, return everything to the pan and cook over low heat, stirring constantly with a spatula and scraping the base, until it reaches 180 to 182°F (82 to 83°C) and coats the back of the spatula. Pour it straight over the chopped gianduja, wait a minute, then blend with a stick blender until glossy. Press film to the surface and refrigerate at least 2 hours.
Make the compote and the praline
Cook the raspberries with the sugar and lemon juice over medium heat for 4 to 5 minutes, crushing about half of them and leaving the rest whole. Stir in the slaked cornstarch, bring back to a bubble for 30 seconds until it turns clear and lightly thickened, then cool. For the praline, cook the sugar and water without stirring to a medium amber, around 340°F (171°C), stir in the whole toasted hazelnuts and the pinch of salt, pour onto a silicone mat and spread it thin. When it is hard, break it into shards or crush it coarsely.
Portion and bring to serving temperature
Trim the domed edge if there is one and cut the cake into clean rectangles or wedges with a long knife warmed under hot water and wiped dry. Take the slices out of the refrigerator 30 minutes before service. Serving temperature matters more here than in an ordinary chocolate cake: at 45°F (7°C) the butter and cocoa butter are firm and the crumb reads dry and waxy, while at 64 to 68°F (18 to 20°C) it reads exactly as it should.
Plating
Plate on room temperature ceramic, never on anything chilled. A cold plate pulls the underside of the slice below the point where its fats firm up, and within two minutes the crumb that took three hours to set correctly is eating tight and dry from the bottom up.
Set a clean rectangle of cake slightly left of centre with its cut face towards the diner, so the grain of the crumb and the flecks of hazelnut meal are visible. Shape one quenelle of gianduja crémeux with two warmed spoons and lay it against the long side of the slice, touching it. The crémeux should be cold and dense and should hold its ridges, which means working it straight from the refrigerator and returning the bowl there between plates.
Spoon the raspberry compote into a single compact pool on the opposite side, close enough that a fork can reach cake, crémeux and fruit in one pass, and resist smearing it into a streak. The acidity is structural on this plate, not decorative: without it the hazelnut oil and the cocoa butter coat the palate and the last bite tastes heavier than the first. Finish with a small cluster of praline shards, a light dusting of cocoa across the bare part of the plate and three or four flakes of salt on the crémeux.
Professional Technique
Everything technical about this cake follows from one substitution. Work through the fats and the picture is clear: 8 tbsp (113 g) of butter contributes about 92 g of fat, the 70 percent chocolate about 46 g of cocoa butter, the gianduja roughly 40 g split between cocoa butter and hazelnut oil, and 1 cup (125 g) of ground hazelnuts about 77 g of pure hazelnut oil. Add the hazelnut contributions together and something close to two fifths of the total fat in the crumb is an oil that is fully liquid at 68°F (20°C) and stays liquid well below freezing.
A conventional chocolate cake firms as it cools because essentially all of its fat crystallises. This one cannot. The starch gelatinises and the egg proteins coagulate as normal, so there is a real set structure, but it is a structure suspended in a partly liquid fat phase, and that has three consequences. The crumb is permanently softer than the baking time would suggest. It resists staling, because the liquid oil keeps mobility in the crumb that a crystallised fat removes. And the finished cake gives under a fingertip in a way that reads, wrongly, as underbaked.
This is why the doneness test has to change. A skewer works on a lean cake because raw batter sticks and baked crumb does not. Here the skewer comes out coated in liquid hazelnut oil and melted gianduja whatever the state of the interior, and the smear it carries is indistinguishable from batter. The probe thermometer is the only honest instrument: egg proteins in a batter this rich are fully coagulated by 200°F (93°C), and anything beyond 208°F (98°C) is driving out water the crumb needs. Bake by the number, not by the stick.
The last technical point is where the set actually happens. Because the fat phase is only partly crystallisable, far more of the final structure forms during cooling than in a butter cake, and it forms slowly. A cake turned out at 120°F (49°C) will sag and tear. The same cake left in its pan until it reaches room temperature comes out as a single clean disc. Three hours on the rack is not caution, it is the second half of the recipe.
Texture and Moisture Control
The target is a fine moist crumb that holds a clean cut edge and yields immediately on the tongue, against a crémeux that is dense and cold, a compote that is bright and slightly loose, and praline that snaps. Four textures, four different failure modes, and only one of them happens in the oven.
For the cake itself, moisture is governed almost entirely by the final internal temperature. Between 200 and 203°F (93 to 95°C) the crumb holds the water it needs. By 210°F (99°C) it has lost enough that the slice turns crumbly at the edges within a day, and no amount of crémeux beside it will disguise that. Oven position matters too: bake on the middle shelf and rotate the pan once at the 25 minute mark, because a cake with this much fat browns unevenly under a hot spot and a dark rim sets harder than the centre.
The crémeux needs the opposite discipline. Cooked past 185°F (85°C) the yolks scramble and no amount of blending will bring back the gloss, and undercooked below about 176°F (80°C) it will never set firm enough to hold a quenelle. Blend it while it is still warm to break the fat into fine droplets, then press film directly onto the surface so no skin forms, and give it a minimum of 2 hours cold before you try to shape it.
The praline is the fragile one on the plate. It absorbs atmospheric moisture within an hour in a humid kitchen and goes from snapping to bending without any visible change. Keep it in a sealed tin, break it only as plates go out, and never set it down on the compote or against the crémeux in advance. The compote itself should be thickened just enough to sit in a pool without spreading, which is what the small measure of slaked cornstarch is for, and it should still taste sharp after cooling.
Professional Mise en Place
This is a make ahead dessert in every component. Bake the cake the day before, make the crémeux and the compote alongside it, and leave only the praline and the plating for the day of service.
Equipment and tools
Round cake pan, 8 inch (20 cm), with parchment cut to the base
Digital probe thermometer, used for the cake, the crémeux and the caramel
Stand mixer or hand mixer for the whites, plus a clean grease free bowl
Food processor for the hazelnut meal, and a silicone mat for the praline
Wide silicone spatula, stick blender, long thin slicing knife, cooling rack
Prepared ahead
Hazelnuts toasted and skinned, up to 3 days ahead in a sealed jar
Cake baked and cooled, up to 2 days ahead, wrapped once fully cold
Gianduja crémeux, up to 3 days ahead, film pressed to the surface
Raspberry compote, up to 4 days ahead, refrigerated in a sealed container
Praline made on the day of service and held in an airtight tin
Service setup
Slices portioned and standing at room temperature for 30 minutes before service
Crémeux cold in a bowl over ice, with two spoons in hot water for quenelles
Compote at cool room temperature in a small container with a teaspoon
Praline broken to order, kept dry and away from the compote
Plates at room temperature, cocoa in a fine sieve, salt flakes within reach
Chef Tips
Buy real gianduja chocolate and read the label before you do. A genuine one lists hazelnuts high in the ingredients and carries between 20 and 40 percent of them, which is what gives this cake its character. A cheap imitation made with vegetable fat and hazelnut flavouring brings none of the oil and none of the aroma, and the cake it produces is simply a slightly sweet chocolate cake with a lower cocoa percentage.
Grind the hazelnuts coarser than you think you should. A fine flour disappears into the crumb and its only contribution is fat, while a coarse meal with some pieces left at the size of coarse sand gives the slice a faint grain that the tongue registers and that tells the eater there are nuts in here. Pulse in one second bursts and stop early, because the point at which meal becomes paste arrives without warning.
Weigh the flour rather than scooping it. At 1/3 cup (40 g) it is a small quantity holding together a batter with a great deal of fat, and a scooped cup that delivers 55 g instead of 40 g will tighten the crumb noticeably and cost the cake the softness that is the whole point. If you have no scale, spoon the flour into the cup and level it with a knife rather than dipping.
Make the cake a day ahead if you can. The crumb of a gianduja cake improves overnight in a way that a butter cake does not, because the liquid hazelnut oil continues migrating through the structure and evens out the moisture. Wrap it only once it is completely cold, keep it at room temperature rather than in the refrigerator, and cut it the next day.
Common Mistakes
Trusting the skewer test. Liquid hazelnut oil and melted gianduja coat a skewer at every stage of the bake, so it comes out smeared whether the cake is done or raw. Cooks read that as underbaked, return the pan to the oven and dry the crumb out. Use a probe and pull at 200 to 203°F (93 to 95°C).
Turning the cake out while it is warm. Most of the structure forms as the fat recrystallises during cooling, so a warm cake has almost nothing holding its centre together and will sink or tear on the rack. Leave it in the pan until it reaches room temperature, which takes 2 to 3 hours.
Pouring the melted chocolate in hot. Above about 105°F (41°C) the mixture begins to cook the yolks on contact and thins the batter irreversibly. Let it fall to 95°F (35°C) before it goes anywhere near the eggs, and check with a probe rather than the back of a finger.
Whipping the whites to stiff peaks. A batter this heavy needs whites that can still flow into it. Stiff dry whites break into pieces during folding and bake into pale tunnels through the crumb. Take them to glossy medium peaks that slump gently at the tip.
Grinding the hazelnuts to a paste. A processor run continuously turns toasted nuts into butter in under a minute, and that butter releases its oil into the batter all at once, giving a greasy dense crumb with no nut texture at all. Pulse, and stop while the meal still looks like coarse sand.
Serving the cake straight from the refrigerator. Cold firms the butter and cocoa butter while doing nothing to the hazelnut oil, which produces a slice that is simultaneously waxy and heavy. Thirty minutes at room temperature transforms it and costs nothing.
Skipping the raspberry compote. It looks like decoration and it is not. The plate carries a very large quantity of fat between the cake, the crémeux and the praline, and without a sharp acidic element the palate saturates after three or four mouthfuls.
Wine Pairing
Vin Santo del Chianti Classico DOC: Dried Trebbiano and Malvasia aged for years in small sealed barrels, and the oxidative character it develops there is exactly what this cake wants. Walnut, dried apricot and toasted almond meet the roasted hazelnut directly rather than contrasting with it, while the high acidity that survives the drying cuts through a crumb carrying this much oil. Pour it at around 55°F (13°C) in a small glass.
Montefalco Sagrantino Passito DOCG: Sagrantino has the highest polyphenol content of any Italian grape, and in its sweet dried grape version that tannin arrives with sugar behind it. The combination is unusually good with 70 percent chocolate: the tannin meets the cocoa solids on equal footing instead of being stripped, and the blackberry and dried plum fruit lines up with the raspberry compote on the plate.
Sangue di Giuda dell'Oltrepò Pavese DOC: A sweet frothy red from the Lombard hills, low in alcohol and built for the afternoon rather than the cellar. Its cherry and violet perfume and its soft carbon dioxide lift a rich slice without adding weight, and the modest sweetness stops well short of the crémeux. This is the informal choice, and the right one if the cake is being eaten in the Piedmontese way, at four in the afternoon.
Girò di Cagliari DOC: A sweet Sardinian red from a nearly extinct grape, warm and gently spirited, with dried fig, carob and a resinous edge. Its alcohol carries the fat of the crémeux in a way lighter wines cannot, and its faint bitterness on the finish picks up the cocoa in the crumb. Serve it cool, around 59°F (15°C), and keep the pour small.
Storage & Reheating
The cake keeps better than most chocolate cakes precisely because of the hazelnut oil in it. Wrapped tightly in film once completely cold, it holds at cool room temperature for 4 days with no meaningful loss of texture, and it is arguably better on day two than on day one. Do not refrigerate a whole cake unless the kitchen is genuinely hot, since the cold firms the butter and cocoa butter and the crumb needs half an hour out to recover each time.
For longer storage, freeze the uncut cake whole. Cool it fully, wrap it in a double layer of film and then in foil, and freeze for up to 2 months at 0°F (-18°C). Thaw it still wrapped, overnight in the refrigerator and then 2 hours at room temperature, so that any condensation forms on the wrapping rather than on the surface of the cake. Do not freeze individual slices unwrapped on a tray, because the cut faces dry and the crumb takes up freezer aromas within days.
The crémeux keeps refrigerated for 3 days under film pressed to its surface and does not freeze well, splitting on thaw into grain and oil. The compote keeps 4 days refrigerated in a sealed jar and freezes without complaint for a month. The praline is the shortest lived element: 2 days at most in an airtight tin at room temperature, and less than that in humid weather. There is no reheating step for any part of this dessert, since every component is served cold or at room temperature.
Nutrition
Per serving, based on 10 slices, including crémeux, compote and praline:
Calories: 565 kcal
Total Fat: 40 g
Saturated Fat: 17 g
Trans Fat: 0 g
Unsaturated Fat: 21 g
Cholesterol: 165 mg
Sodium: 110 mg
Total Carbohydrates: 45 g
Fiber: 5 g
Total Sugars: 34 g
Added Sugars: 27 g
Protein: 9 g
Lactose: 1.8 g
Principal micronutrients: vitamin E, manganese, copper, magnesium, iron, potassium, vitamin C from the raspberries
These figures are estimates. The fibre and the vitamin E come almost entirely from the hazelnuts and the cocoa, and the split between saturated and unsaturated fat shifts with the cocoa percentage of the chocolate you use and with how much hazelnut your gianduja actually contains.
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