Walnut Dacquoise with Coffee Buttercream (Low Carb and Gluten-Free)


I can distinctly remember the first time I had a dacquoise. This is perhaps because I haven’t had all that many, and so the first stands out clearly. But I do know that it was something of a revelation to me. My father had flown out to see me at university around my birthday and took me to a lovely celebratory dinner, something far finer than I could afford on my student’s budget. I don’t remember much else about the dinner except for the delicious chocolate hazelnut dacquoise I chose for dessert. That a cake could consist of something other than traditional sponge and icing, could have crisp hazelnutty meringue layers instead of soft, flour-based layers, was such a wonderful discovery to me. It tasted like a ferroro rocher chocolate and I was in heaven. Even the name was poetic, that beautiful French word rolling off the tongue and signifying deliciousness.

That cake has never been all that far from my mind, quite honestly, as I am sure you can tell from my introductory paragraph. And I even attempted making one myself several years ago, before I knew I was facing a lifetime of diabetes. I had come across THIS recipe for a walnut dacquoise and I gave it a go, with one major change…I topped the whole thing off with chocolate ganache, letting it drip down the sides. It was a more difficult endeavour than I thought it would be. Getting even layers of the walnut meringue was tough for a person as impatient as I am, and I think I didn’t add enough sugar, as they deflated a little while baking. But the overall effect was utterly delicious. My mum and her husband were visiting from out of town and her husband said it tasted just like a Coffee Crisp chocolate bar. Those of you from Commonwealth countries will know that this was high praise, indeed!

I’ve often thought that a dacquoise would make a great low carb cake, since it is already gluten free. I was a little unsure of the meringue layers and whether I could get them to crisp up properly. But now that there are powdered versions of many erythritol brands, I knew I could get a good low carb buttercream to sandwich between the layers, and of course, I love my low carb version of chocolate ganache. I was intending to make this for my own birthday which is in a few weeks, but I really wanted to give it a go sooner than that.

The Results: At first I wasn’t sure it would be a success, since the meringue layers still seemed so soft in the oven. But an hour with the oven off, and they were perfectly crisp. The buttercream has a nice strong coffee flavour, and using chocolate ganache on the top and letting it drip down the sides always saves me the trouble of having to try my hand a cake-decorating, perhaps my biggest weakness as a baker. My whole family loved this and happily gobbled it up for dessert. I will say, though that it is VERY rich and sweet. A small slice goes a long way, and I might almost consider reducing the amount of powdered erythritol in the buttercream.

As always when I use full strength erythritol, I chose to go with Swerve because it doesn’t seem to have the cooling effect noticeable in many other brands. One other little note…make sure your butter is properly softened, or your buttercream will lump up and won’t be smooth.

Walnut Dacquoise with Coffee Buttercream

Dacquoise Layers:
3/4 walnuts, lightly toasted
3/4 cup granulated erythritol (I used Swerve), divided use
1 tbsp arrowroot starch
3 egg whites, room temperature
1/2 tsp cream of tartar
1/2 tsp vanilla extract

Coffee Buttercream:
1 tbsp instant coffee
1 1/2 tbsp hot water
4 oz cream cheese, softened
8 tablespoons butter, softened
3/4 cup powdered erythritol (I used Swerve)
1/2 tsp vanilla extract
1/2 cup whipping cream

Chocolate Ganache:
5 tbsp butter
2 oz unsweetened chocolate, chopped
2 tbsp powdered erythritol or xylitol
1/4 cup cocoa powder
1/4 tsp vanilla extract
16 drops stevia extract

For the dacquoise, preheat oven to 250F and trace 3 9×5 inch rectangles onto parchment paper (I traced the bottom of a loaf pan). Place parchment on large cookie sheet.

Combine walnuts, 1/4 cup of the erythritol and arrowroot starch in a food processor and process until finely ground. Set aside.

In a large clean bowl, beat egg whites and cream of tarter until soft peaks form. Add the remaining 1/2 cup erythritol slowly until stiff, glossy peaks form. Beat in the vanilla, and then gently fold in the ground walnut mixture until fully combined.

Divide the mixture evenly among the traced rectangles and spread into an even layer. Bake until dacquoise layers are golden brown, about 1 hour (they will still be soft to the touch). Turn off oven and let layers continue to crisp up, about 1 more hour. Peel off parchment.

For the buttercream, combine instant coffee and hot water together in a small bowl and stir until coffee dissolves. Set aside.

In a large bowl, beat cream cheese and butter together until smooth. Add the powdered erythritol and beat until combined. Beat in coffee mixture and vanilla extract until combined, scraping down beaters and sides of bowl as needed.

In a medium bowl, beat whipping cream until stiff peaks form. Gently fold whipped cream into cream cheese mixture until smooth.

To assemble cake, spread one or two tablespoons of the buttercream onto a serving platter or cake plate, and lay the first layer of dacquoise on it to help adhere it to the plate. Spread 1/3 of remaining buttercream on first layer. Repeat with remaining dacquoise and butter cream. Refrigerate for at least two hours to allow buttercream to set.

For the ganache, melt butter, chocolate and powdered erythritol together in a small saucepan over low heat. Stir in cocoa powder, vanilla and stevia and whisk until smooth. Remove from heat and let sit 5 to 10 minutes until glaze is thickened but still pourable. Pour chocolate glaze over the top of the cake and spread with a knife or offset spatula, pushing to the edges and letting it drip down over the sides. Let set 30 minutes before serving.

Slice carefully with a sharp knife dipped in hot water, to allow for even, clean slices.

Serves 10 (at least, as it’s very rich and sweet). Each slice has a total of 4.9 g of carbs and 1.6 g of fiber. Total NET CARBS = 3.3 g.

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  1. says

    This is beautiful, Carolyn! I'm always amazed at how you manage to turn even the most extravagant dishes and desserts GF and Low Carb, not losing any of the decadence. Love this and will bookmark it for my GF pals..and me, of course 😉

  2. says

    Lovely memory and the "dacquoise" does indeed speak of delicious eating. Love the adaption – the photos speak of flavor. and the low-carb and low sugar is heartening.

  3. says

    I am speechless that I have never had – never even heard of! – dacquoise. I have really been missing out! Thank you for enlightening me.

  4. Shirley says

    That second photo with the pouring chocolate looks heavenly! I'm not sure if I've ever had a dacquoise, but your description makes me think I'd remember.

  5. says

    You got crisp meringue! (Haven`t you been trying to get low carb/gluten free meringue perfected for a while?)

    This looks insane. So many things to talk about in this post! Coffee Crisp, ganache, meringue…but the most important is, you cannot make your own birthday cake! If I thought it would make it, I'd bake this up and put it in the post just in time.

    But between Canada Post and USPS, I think we'll have to come up with another plan 😉 Theresa

  6. spabettie says

    no, there really isn't anything better than chocolate dripping off cake – this looks absolutely perfect – YUM

  7. Rica says

    I adore coffee buttercream. Ever since I saw this dessert, I was reminded of the dacquoise I made in a baking class and how unique it seemed to me. Of course, that one was full of sugar, so when I saw this one, I really wanted to make it. Saturday, I finally bit the bullet and made it for a gathering later in the day. It was a HIT! Wish I had thought to make it sooner! My husband who is super fussy even liked it, and wanted me to make another the next day! Thank you so much for a lovely cake and bringing back some happy memories.

    • Carolyn says

      Oh dacquoise. Love the stuff. I actually made a low carb one and it was good, but the meringue layers were a little overly crispy. I’ve been meaning to try again…

    • Carolyn says

      I am sorry, I don’t have that for this recipe. But you are welcome to run the ingredients through a software like my fitnesspal

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