Filbert Gateau with Praline Buttercream

This was my very first Daring Bakers’ Challenge, and was it ever a challenge! I’ve never made a cake that was nearly this involved, but it was really fun, a great learning experience, and the end result was absolutely delicious! The cake was light and nutty, the buttercream was to die for, and everything in between was simply heavenly. Recipe behind the jump!

Filbert Gateau with Praline Buttercream
Let’s start with the hazelnuts. Roast them in a 350 degree F oven for 12-15 minutes or until the skins begin to blister.

Filbert Gateau with Praline ButtercreamFilbert Gateau with Praline Buttercream
Wrap the hazelnuts in a kitchen towel and allow to steam for a few minutes.

Filbert Gateau with Praline Buttercream
Using the towel, rub the skins off of the hazelnuts (they’ll come off very easily).

Filbert Gateau with Praline Buttercream
Gather your cake ingredients.

Filbert Gateau with Praline Buttercream
Pulse the dry ingredients and hazelnuts in your food processor or blender.

Filbert Gateau with Praline ButtercreamFilbert Gateau with Praline Buttercream
Beat the egg yolks until light and thick.

Filbert Gateau with Praline Buttercream
Add the sugar, lemon zest, and vanilla.

Filbert Gateau with Praline ButtercreamFilbert Gateau with Praline Buttercream
Set the egg yolk mixture aside.

Filbert Gateau with Praline Buttercream
Whip the egg whites until light and fluffy. Slowly add the remaining sugar.

Filbert Gateau with Praline Buttercream
Fold the egg whites into the yolk mixture, then quickly mix that into the dry ingredients and melted butter. I made a mini cake, so I baked mine at 350 degrees F for about 20-25 minutes.

Filbert Gateau with Praline Buttercream
While the cake is baking, prepare your other components. First, heat sugar and water over medium heat until the sugar is fully dissolved and set aside.

Filbert Gateau with Praline Buttercream
Now make your hazelnut brittle for the praline buttercream.

Filbert Gateau with Praline Buttercream
Heat and melt your sugar in a shallow pan, then add the hazelnuts and coat completely.

Filbert Gateau with Praline ButtercreamFilbert Gateau with Praline Buttercream
Spread out the sugar/hazelnut mixture onto a greased or lined pan and allow to cool.

Filbert Gateau with Praline Buttercream
Golden and delicious!

Filbert Gateau with Praline ButtercreamFilbert Gateau with Praline Buttercream
Break up the brittle into pieces and pulse in your blender or food processor until it becomes a fine powder. To make the paste, continue to pulse the mixture until thick.

Filbert Gateau with Praline ButtercreamFilbert Gateau with Praline Buttercream
Now make your buttercream. Simply beat together the butter and powdered sugar until creamy, then add vanilla and a bit of milk.

Filbert Gateau with Praline ButtercreamFilbert Gateau with Praline ButtercreamFilbert Gateau with Praline Buttercream
Beat half of the buttercream into 1/3 cup of praline paste.

Filbert Gateau with Praline ButtercreamFilbert Gateau with Praline Buttercream
Put the frosting in a bowl and set aside (you have no idea how good this frosting is).

Filbert Gateau with Praline Buttercream
Beat your heavy cream for a while until it forms stiff peaks.

Filbert Gateau with Praline Buttercream
Whipped cream!

Filbert Gateau with Praline Buttercream
Strain your preserves through a mesh sieve to get any clumps of fruit out, then simmer the jam until thick. Set aside to cool a bit.

Filbert Gateau with Praline Buttercream
Now for the fun part! Slice your cakes in half, then spread sugar syrup onto one side of the cake. Top with the praline buttercream.

Filbert Gateau with Praline Buttercream
Then top with the whipped cream.

Filbert Gateau with Praline Buttercream
Repeat again…

Filbert Gateau with Praline Buttercream

Filbert Gateau with Praline Buttercream
And again! Then coat with your fruit glaze and refrigerate while you make the ganache.

Filbert Gateau with Praline Buttercream
Ganache ingredients.

Filbert Gateau with Praline Buttercream
Chop up your chocolate.

Filbert Gateau with Praline Buttercream
Then, after boiling your heavy cream and corn syrup, pour the hot mixture over the chocolate and mix until completely melted.

Filbert Gateau with Praline Buttercream
Put your cake on a rack over a pan or something similar that will catch the ganache drippings.

Filbert Gateau with Praline Buttercream
And cover the cake with the ganache. Put in the fridge to cool.

Filbert Gateau with Praline Buttercream
Finally, you get to frost your cake! I piped praline buttercream all over mine because I had a ton leftover.

Filbert Gateau with Praline ButtercreamFilbert Gateau with Praline ButtercreamFilbert Gateau with Praline Buttercream
My baby is completed! And it was SO worth it. It tasted like a Ferrer Rocher chocolate in cake form!

Filbert Gateau with Praline ButtercreamFilbert Gateau with Praline ButtercreamFilbert Gateau with Praline ButtercreamFilbert Gateau with Praline ButtercreamFilbert Gateau with Praline Buttercream

Filbert Gateau with Praline Buttercream
Prep time: 
Cook time: 
Total time: 
Serves: 10-12 servings
To Make the Cake:
  • 1 Filbert Genoise
  • 1 recipe sugar syrup, flavored with dark rum
  • 1 recipe Praline Buttercream
  • ½ cup heavy cream, whipped to soft peaks
  • 1 recipe Apricot Glaze
  • 1 recipe Ganache Glaze, prepared just before using
  • 3 tablespoons hazelnuts, toasted and coarsely chopped
For the Filbert Genoise:
  • 1 ½ cups hazelnuts, toasted/skinned
  • ⅔ cup cake flour, unsifted
  • 2 Tbsp. cornstarch
  • 7 large egg yolks
  • 1 cup sugar, divided ¼ & ¾ cups
  • 1 tsp. vanilla extract
  • ½ tsp. grated lemon rind
  • 5 lg. egg whites
  • ¼ cup softened butter
For the Sugar Syrup:
  • Makes 1 cup, good for one 10-inch cake – split into 3 layers
  • 1 cup water
  • ¼ cup sugar
  • 2 Tbsp. dark rum or orange flavored liqueur (optional)
For the Praline Buttercream:
  • 1 recipe Swiss Buttercream (I used a simple buttercream, which I will also post)
  • ⅓ cup praline paste
  • 1 ½ - 2 Tbsp. Jamaican rum (optional)
For the Swiss Buttercream:
  • 4 lg. egg whites
  • ¾ cup sugar
  • 1 ½ cups (3 sticks) unsalted butter, slightly firm
  • 1 ½ -2 Tbsp. Grand Marnier or liqueur of your choice
  • 1 tsp. vanilla
For the Simple Buttercream:
  • 3 cups powdered sugar
  • 1½ sticks butter, softened
  • 1½ tsp vanilla extract
  • 2 Tbsp milk
For the Praline Paste:
  • 1 cup (4 ½ oz.) hazelnuts, toasted/skinless
  • ⅔ cup sugar
  • line a jelly roll pan with parchment or tinfoil and lightly butter.
For the Apricot Glaze:
  • Good for one 10-inch cake
  • *I used cherry preserves of apricot*
  • ⅔ cup thick apricot preserves
  • 1 Tbsp. water
For the Ganache Glaze:
  • Makes about 1 cup, enough to cover the top and sides of a 9 or 10 inch layer or tube cake
  • **Ganache can take on many forms. While warm – great fudge sauce. While cool or lukewarm – semisweet glaze. Slightly chilled – can be whipped into a filling/frosting. Cold & solid – the base of candied chocolate truffles.
  • 6 oz. (good) semisweet or bittersweet chocolate, like Lindt
  • 6 oz. (¾ cup heavy cream
  • 1 tbsp. light corn syrup
  • 1 Tbsp. Grand Marnier, Cointreay, or dark Jamaican rum (optional)
  • ¾ tsp. vanilla
  • ½ - 1 tsp. hot water, if needed
For the Filbert Genoise:
  1. Position rack in the lower 3rd of the oven and preheat to 350 degrees. Grease and flour a 10” X 2” inch round cake pan (or whatever size you like).
  2. Using a food processor or blender, process nuts, cake flour, and cornstarch for about 30 seconds. Then, pulse the mixture about 10 times to get a fine, powdery mixture. You’ll know the nuts are ready when they begin to gather together around the sides of the bowl. While you want to make sure there aren’t any large pieces, don’t over-process. Set aside.
  3. Put the yolks in the bowl of an electric mixer, with the whisk attachment, and beat until thick and light in color, about 3-4 minutes on med-high speed. Slowly, add ¾ cup of sugar. It is best to do so by adding a tablespoon at a time, taking about 3 minutes for this step. When finished, the mixture should be ribbony. Blend in the vanilla and grated lemon rind. Remove and set aside.
  4. Place egg whites in a large, clean bowl of the electric mixer with the whisk attachment and beat on medium speed, until soft peaks. Increase to med-high speed and slowly add the remaining ¼ cup of sugar, over 15-20 seconds or so. Continue to beat for another ½ minute.
  5. Add the yolk mixture to the whites and whisk for 1 minute.
  6. Put the butter in a spouted container. * It must be a deep bottom bowl and work must be fast.* Put the nut meal in a mesh strainer (or use your hand – working quickly) and sprinkle it in about 2 tablespoons at a time – folding it carefully for about 40 folds. Be sure to exclude any large chunks/pieces of nuts. Again, work quickly and carefully as to not deflate the mixture. When all but about 2 Tbsp. of nut meal remain, quickly and steadily pour the warm butter over the batter. Then, with the remaining nut meal, fold the batter to incorporate, about 13 or so folds.
  7. With a rubber spatula, transfer the batter into the prepared pan, smoothing the surface with the spatula or back of a spoon. **If collected butter remains at the bottom of the bowl, do not add it to the batter! It will impede the cake rising while baking.
  8. Tap the pan on the counter to remove air bubbles and bake in the preheated oven for 30-35 minutes. You’ll know the cake is done when it is springy to the touch and it separates itself from the side of the pan. Remove from oven and allow to stand for 5 minutes. Invert onto a cake rack sprayed with nonstick coating, removing the pan. Cool the cake completely.
  9. *If not using the cake right away, wrap thoroughly in plastic wrap, then in a plastic bag, then in the refrigerator for up to 3 days. If freezing, wrap in foil, then the bag and use within 2-3 months.
For the Sugar Syrup:
  1. In a small, yet heavy saucepan, bring the water and sugar to a boil and simmer for 5 minutes. 2. Remove from heat, add the liqueur. Cool slightly before using on the cake. *Can be made in advance.
For the Praline Buttercream:
  1. Blend ½ cup buttercream into the paste, then add to the remaining buttercream. Whip briefly on med-low speed to combine. Blend in rum.
For the Swiss Buttercream:
  1. Place the egg whites in a lg/ bowl of a elevtric mixer and beat with the whisk attachment until the whites are foamy and they begin to thicken (just before the soft peak stage).
  2. Set the bowl over a saucepan filled with about 2 inches of simmering water, making sure the bowl is not touching the water. Then, whisk in the sugar by adding 1-2 tablespoon of sugar at a time over a minutes time. Continue beating 2-3 minutes or until the whites are warm (about 120 degrees) and the sugar is dissolved. The mixture should look thick and like whipped marshmallows.
  3. Remove from pan and with either the paddle or whisk attachment, beat the egg whites and sugar on med-high until its a thick, cool meringue – about 5-7 minutes. *Do not overbeat*. Set aside.
  4. Place the butter in a separate clean mixing bowl and, using the paddle attachment, cream the butter at medium speed for 40-60 seconds, or until smooth and creamy. *Do not overbeat or the butter will become toooooo soft.*
  5. On med-low speed, blend the meringue into the butter, about 1-2 Tbsp. at a time, over 1 minute. Add the liqueur and vanilla and mix for 30-45 seconds longer, until thick and creamy.
  6. Refrigerate 10-15 minutes before using.
  7. Wait! My buttercream won’t come together! Reheat the buttercream briefly over simmering water for about 5 seconds, stirring with a wooden spoon. Be careful and do not overbeat. The mixture will look broken with some liquid at the bottom of the bowl. Return the bowl to the mixer and whip on medium speed just until the cream comes back together.
  8. Wait! My buttercream is too soft! Chill the buttercream in the refrigerator for about 10 minutes and rewhip. If that doesn’t work, cream an additional 2-4 Tbsp. of butter in a small bowl– making sure the butter is not as soft as the original amount, so make sure is cool and smooth. On low speed, quickly add the creamed butter to the buttercream, 1 Tbsp. at a time.
  9. Refrigerate in an airtight container for up to 5 days, or can be frozen for up to 6 months. If freezing, store in 2 16-oz. plastic containers and thaw in the refrigerator overnight or at room temperature for several hours.
For the Simple Buttercream:
  1. Cream the sugar, butter and vanilla together. Add the milk and beat until fluffy and smooth.
For the Praline Paste:
  1. Put the sugar in a heavy 10-inch skillet. Heat on low flame for about 10-20 min until the sugar melts around the edges. Do not stir the sugar. Swirl the pan if necessary to prevent the melted sugar from burning. Brush the sides of the pan with water to remove sugar crystals. If the sugar in the center does not melt, stir briefly.
  2. When the sugar is completely melted and caramel in color, remove from heat. Stir in the nuts with a wooden spoon and separate the clusters. Return to low heat and stir to coat the nuts on all sides. Cook until the mixture starts to bubble. **Remember – extremely hot mixture.** Then onto the parchment lined sheet and spread as evenly as possible.
  3. As it cools, it will harden into brittle. Break the candied nuts into pieces and place them in the food processor. Pulse into a medium-fine crunch or process until the brittle turns into a powder.
  4. To make paste, process for several minutes. Store in an airtight container and store in a cook dry place. Do not refrigerate.
For the Apricot Glaze:
  1. In a small, yet heavy saucepan, bring the water and preserves to a slow boil and simmer for 2-3 minutes. If the mixture begins to stick to the bottom of the saucepan, add water as needed.
  2. Remove from heat and, using a strainer, press the mixture through the mesh and discard any remnants. With a pastry brush, apply the glaze onto the cake while the cake is still warm. If the glaze is too thick, thin to a preferred consistency with drops of water.
For the Ganache Glaze:
  1. Blend vanilla and liqueur/rum (optional) together and set aside.
  2. Break the chocolate into 1-inch pieces and place in the basket of a food processor and pulse until finely chopped. Transfer into a medium sized bowl and set aside.
  3. Heat the cream and corn syrup in a saucepan, on low, until it reached a gentle boil. Once to the gently boil, immediately and carefully pour over the chocolate. Leave it alone for one minute, then slowly stir and mix the chocolate and cream together until the chocolate is melted and incorporated into the cream.
  4. Carefully blend in vanilla mixture. If the surface seems oily, add ½ - 1 tsp hot water. The glaze will thicken, but should still be pourable. If it doesn’t thicken, refrigerate for about 5 minutes, but make sure it doesn’t get too cold!
Assembling the Cake:
  1. Cut a cardboard disk slightly smaller than the cake. Divide the cake into 3 layers and place the first layer top-side down on the disk. Using a pastry brush, moisten the layer with 3-4 Tbsp. of warm sugar syrup. Measure out 1 cup of praline buttercream and set aside. (I just used a plate to put the cake on because I'm lazy).
  2. Spread the bottom layer with a ¼-inch thickness of the remaining buttercream. Cover with ½ of the whipped cream, leaving ¼-inch border around the edge of the cake. Place the middle layer over the first, brush with sugar syrup, spreading with buttercream. Cover with the remaining whipped cream.
  3. Moisten the cut side of the third layer with additional sugar syrup and place cut side down on the cake. Gently, press the sides of the cake to align the layers. Refrigerate to chill for at least 30 minutes.
  4. Lift the cake by sliding your palm under the cardboard/use a spatula to lift the cake. Holding a serrated or very sharp night with an 8-ich blade held parallel to the sides of the cake, trim the sides so that they are perfectly even. Cut a slight bevel at the top to help the glaze drip over the edge.
  5. Brush the top and sides of the cake with warm apricot glaze, sealing the cut areas completely. Chill while you prepare the ganache.
  6. Place a rack over a large shallow pan to catch the ganache drippings. Remove the gateau from the refrigerator and put it the rack.
  7. With a metal spatula in hand, and holding the saucepan about 10 inches above the cake, pour the ganache onto the cake’s center. Move the spatula over the top of the ganache about 4 times to get a smooth and mirror-like appearance. The ganache should cover the top and run down the sides of the cake.
  8. When the ganache has been poured and is coating the cake, lift one side of the rack and bang it once on the counter to help spread the ganache evenly and break any air bubbles. (Work fast before setting starts.) Patch any bare spots on the sides with a smaller spatula, but do not touch the top after the “bang”. Let the cake stand at least 15 minutes to set after glazing.
  9. To garnish the cake, fit a 12 – 14-inch pastry bag with a #114 large leaf tip. Fill the bag with the reserved praline cream. Stating ½ inch from the outer edge of the cake, position the pastry tube at a 90 degree angle with the top almost touching the top of the cake. Apply pressure to the pastry bag, moving it slightly toward the center of the cake. As the buttercream flows on the cake, reverse the movement backward toward the edge of the cake and finish by pulling the bag again to the center. Stop applying pressure and press the bag downward, then quickly pull the tip up to break the flow of frosting. Repeat, making 12 leaves evenly spaced around the surface of the cake. (I obviously didn't do this because I don't have the specific pastry tips or anything like that).
  10. Make a second row of leaves on the top of the first row, moving the pastry bag about ¾ inch closer to the center. The leaves should overlap. Make a 3rd row, moving closer and closer to the center. Add a 4th row if you have the room. But, leave a 2-inch space in the center for a chopped filbert garnish (I ran out of hazelnuts so I couldn't do this part). Refrigerate uncovered for 3-4 hours to allow the cake to set. Remove the cake from the refrigerator at least 3 hours before serving.
  11. Leftover cake can be covered with foil and kept in the refrigerator for up to 5 days.
Adapted From
Great Cakes by Carol Walter


14 Responses

  1. Janaki says:

    omg that looks so INTENSE! I dont want to imagine the cleanup. Next time make it bigger so you get more for you time investment :D?

  2. thecrepesofwrath says:

    haha I “thirded” the cake recipe but made full amounts of everything else out of fear that it might not turn out well! But I made it tiny because it was just going to be Kramer and me eating it and you know how that goes.

  3. shellyfish says:

    I think that your decorating skills are incredible! Welcome to the Daring Bakers – you rock!

  4. Mary says:

    Great photos–and your cake looks super yummy as well! Welcome!

  5. Dana says:

    Wow – your cake is so fluffy and light! Mine was dense! Overfolding?

  6. Marie says:

    Bravo on your first challenge. Your cake looks lovely.

  7. KJ says:

    Wow, now that’s a cake!!!

  8. Lisa says:

    Hmmmm – and I just ate the leftover buttercream with a spoon thinkin’ BONUS! …. Welcome to the group :)

  9. Joanna says:

    Wow! your cake looks spectacular. i simply love the step-by-step instructional photos… way to go on this months DB challenge :)

  10. Debyi says:

    Your cake looks amazing! Awesome piping job.

  11. Lauren says:

    Ooo, your cake looks amazing! I love your design!

  12. Mer says:

    This cake was amazing. I stumbled across it a few weeks ago… and it got me started on Daring Bakers! I will start up in April. So excited!

  13. Khan says:

    Hello, I don’t have hazelnut but I do have hazelnut flour, which is already ground up hazelnut from the store. Since I don’t have real round real hazelnut, I would like to use hazelnut flour. I have no other option left other then to use hazelnut flour. I cannot find hazelnut in my country. I really want to bake this cake.

    Can u tell me how much cups or grams of hazelnut flour should I use? 1 and1/2 cup hazelnut n 1and1/2 cup hazelnut flour is not the same.

    • Sydney says:

      Hi Khan – unfortunately I have never used hazelnut flour so I am not sure about this. Perhaps you might want to ask someone at a bakery or do a small version to test before you go full scale?

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