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Three layers of walnut sponge filled with coffee buttercream and sealed under a dark chocolate glaze, the Konditorei classic that proves a handful of walnuts can outperform a bag of flour.
Every Konditorei in Vienna has a Nusstorte in the glass case. It sits there between the Sachertorte and the Dobostorte, dark and quiet, not calling attention to itself. Most tourists walk past it. That's their loss.
Gretel always said the nut tortes were the truest test of a Viennese baker. There's almost no flour in this cake. Ground walnuts do the structural work, and they do it differently: denser, moister, with a richness that wheat flour could never give you. The crumb is close and tender. It stays that way for days because the oils in the nuts keep everything from drying out. When I was training at GAFA in Vienna, our pastry instructor made us bake Nusstorte three times before he'd let us move on to anything else. He said if you understood what the walnuts were doing in this batter, you understood Viennese Torten.
The coffee buttercream between the layers is not optional and not interchangeable. Coffee and walnuts belong together in Austrian baking the way apricot and chocolate do in Sachertorte. The bitterness of the coffee pulls the sweetness of the buttercream back from the edge, and the walnuts meet both flavors halfway. Then you seal the whole thing under a thin, glossy coat of dark chocolate. Pour it, don't spread it. Let it set until you can see yourself in it.
This is a cake that rewards precision. Weigh your ingredients. Whip your egg whites properly. Let everything cool when the recipe says to cool. The Konditorei tradition is built on patience and clean technique, not fuss. Follow the steps and you'll have a Torte that looks like it came from behind that glass counter.
Austria's Nusstorten descend from the rich nut cake traditions of Hungary and Bohemia, which entered Viennese kitchens through the Habsburg empire's culinary crossroads. By the mid-19th century, the Konditorei had elevated nut cakes from farmhouse baking into precise, multi-layered constructions with buttercream fillings and chocolate glazes. Walnuts were the prestige nut of the empire, harvested from orchards across Lower Austria and the Wachau valley, and a walnut torte in a Konditorei window signaled serious craftsmanship.
Quantity
6 large
separated
Quantity
150g
Quantity
200g
finely ground
Quantity
30g
Quantity
1 packet (8g)
Quantity
half
zested
Quantity
pinch
Quantity
200g
softened
Quantity
150g
sifted
Quantity
2 tablespoons
cooled completely
Quantity
1 packet (8g)
Quantity
3 tablespoons
warmed and sieved
Quantity
150g
Quantity
80g
Quantity
1 tablespoon
Quantity
12
for decoration
Quantity
40g
| Ingredient | Quantity |
|---|---|
| eggsseparated | 6 large |
| caster sugar | 150g |
| walnuts (for cake)finely ground | 200g |
| fine dry breadcrumbs | 30g |
| Vanillezucker (for cake) | 1 packet (8g) |
| lemonzested | half |
| salt | pinch |
| unsalted butter (for buttercream)softened | 200g |
| powdered sugarsifted | 150g |
| strong espresso or Mokkacooled completely | 2 tablespoons |
| Vanillezucker (for buttercream) | 1 packet (8g) |
| apricot jam (Marillenmarmelade)warmed and sieved | 3 tablespoons |
| dark chocolate, minimum 70% cocoa | 150g |
| unsalted butter (for glaze) | 80g |
| honey | 1 tablespoon |
| walnut halvesfor decoration | 12 |
| ground walnuts (for sides) | 40g |
Grind the 200g of walnuts in a food processor using short pulses until they're fine and powdery but still dry. Stop the moment they look like coarse sand. One pulse too many and the oils release, you get walnut paste, and the whole cake turns dense and greasy instead of tender. Mix the ground walnuts with the breadcrumbs and set aside. The breadcrumbs absorb moisture during baking and give the crumb just enough structure to hold together without any heaviness.
Preheat your oven to 170°C (340°F). Line the base of a 24cm springform pan with baking parchment and butter the sides lightly. In a large bowl, beat the egg yolks with 100g of the caster sugar and the Vanillezucker until the mixture is pale, thick, and falls in a slow ribbon from the whisk. This takes a good five minutes with an electric mixer. Don't cut it short. The air you trap here is what gives the Torte its lift, because there's almost no flour to provide structure. Stir in the lemon zest.
In a clean, dry bowl, beat the egg whites with the pinch of salt until they form soft peaks. Add the remaining 50g of sugar gradually, a spoonful at a time, beating until the whites are glossy and hold firm, upright peaks. If you tip the bowl and they slide, keep going. These whites are doing the job that flour normally does. They need to be strong enough to carry the weight of 200 grams of ground nuts.
Fold the ground walnut mixture into the egg yolk base, working gently with a large spatula. Then fold in the whipped egg whites in three additions. The first addition loosens the batter. The second and third you treat with respect: cut down through the center, sweep along the bottom, fold over the top. Turn the bowl a quarter turn and repeat. You'll see streaks of white. That's fine. Better a few pale streaks than a deflated batter. Pour into the prepared pan and smooth the top gently. Bake for 35 to 40 minutes, until the surface is golden and springs back when you press it lightly in the center. A skewer should come out with just a few moist crumbs, not wet batter.
Let the cake cool in the pan for ten minutes, then release the springform ring and transfer the cake to a wire rack. Let it cool completely. This takes at least an hour and you cannot rush it. If you slice a warm nut sponge it will crumble and tear. If you spread buttercream on a warm cake it will melt and slide off the sides. Patience. Once cool, use a long serrated knife to slice the cake horizontally into three even layers. A slow, steady sawing motion. Let the knife do the work.
Beat the 200g of softened butter with the sifted powdered sugar and Vanillezucker until light and fluffy, about four minutes. The mixture should turn almost white. Add the cooled espresso a teaspoon at a time, beating after each addition. The buttercream should taste distinctly of coffee but still feel rich and buttery, not like you poured a cup of Mokka into your icing bowl. If the mixture curdles when you add the coffee, it means the butter and liquid are different temperatures. Keep beating. It will come back together.
Place the bottom cake layer cut-side up on a serving plate or cake board. Spread a generous, even layer of coffee buttercream over the surface, about 4 to 5 millimeters thick. Set the middle layer on top, press gently, and spread another layer of buttercream. Place the top layer cut-side down so you have a smooth surface facing up. Spread a very thin layer of buttercream over the top and sides. This is your crumb coat. It doesn't need to be pretty. It seals in the loose crumbs so the glaze goes on clean. Chill the assembled cake in the fridge for thirty minutes until the buttercream firms up. Reserve two tablespoons of buttercream for attaching the walnut decorations later.
Warm the apricot jam in a small saucepan until it loosens, then push it through a fine sieve to remove any fruit pieces. Brush a thin, even layer of the warm sieved jam over the top and sides of the chilled cake. The Marillenmarmelade does two things: it gives the chocolate glaze something to grip, and it adds a bright, sharp note that cuts through the richness of the nuts and buttercream. Gretel always said apricot jam is the secret weapon of Viennese baking. She was right.
Break the dark chocolate into small, even pieces and place them in a heatproof bowl with the 80g of butter and the honey. Set the bowl over a pot of barely simmering water. The bottom of the bowl must not touch the water. Stir gently as everything melts together. When the mixture is completely smooth and glossy, remove from the heat and let it cool for five minutes, stirring occasionally. You want it thick enough to coat a spoon but still pourable. If it's too hot it will run right off the cake. If it's too cool it will set in lumps before you can spread it.
Place the cake on a wire rack set over a baking tray. Pour the chocolate glaze over the center of the cake in one steady, confident pour. Use an offset spatula to guide the glaze over the edges and down the sides with as few strokes as possible. Every time you touch the surface you leave a mark. Less is more. The glaze should settle into a smooth, glossy coat on its own. Let any excess drip off the sides onto the tray below. While the glaze is still tacky, gently press ground walnuts around the bottom half of the sides with your palm. This is the Konditorei finish.
Place twelve walnut halves evenly around the top edge of the Torte, using a tiny dab of the reserved buttercream underneath each one to hold it in place. Let the glaze set completely at room temperature for at least thirty minutes before slicing. The surface should be firm and mirror-smooth. Cut with a knife dipped in hot water and wiped dry between each slice. This gives you clean, sharp edges that show off the three distinct layers inside. Mahlzeit!
1 serving (about 120g)
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