Keto Tiramisu Cake: Gluten-Free Almond Flour Version
A sophisticated no-sugar tiramisu cake reimagined for low-carb and gluten-free diets, this dessert combines the classic Italian flavors of espresso, rum, and cocoa with a delicate almond flour sponge and silky mascarpone custard. The cake delivers the authentic tiramisu experience—rich, coffee-soaked layers with creamy depth—without grains or sugar. What sets this version apart is the homemade almond sponge replacing traditional ladyfingers, creating a sturdier yet tender crumb that absorbs the coffee-rum mixture beautifully. The zabaglione-style custard whipped into cream provides that essential fluffy texture. Perfect for keto dieters, those with gluten sensitivity, and anyone seeking an elegant dessert without compromise. Serve this after dinner, at celebrations, or as a show-stopping potluck contribution. It improves with time as flavors meld, making it ideal for advance preparation.
Ingredients
- 2 ½ cup almond flour, finely milled, measured, and sifted[other low-carb flour blend]1:1gluten-free
coconut flour requires liquid adjustment, not recommended
Full guide → - 2 teaspoon baking powder
- 1 ½ cup granulated sugar substitute[alternative sweetener]varies by productketo
depends on sweetener type, sweetness varies
- ½ teaspoon salt
- 8 eggs, room temperature
- 8 oz cream cheese, full-fat, room temperature
- ½ cup butter, room temperature, softened
- 2 teaspoon vanilla extract
- 8 egg yolks, room temperature
- ¾ cup granulated sugar substitute[alternative sweetener]varies by productketo
depends on sweetener type, sweetness varies
- ¼ teaspoon salt
- 9 oz mascarpone cheese, or 8 oz cream cheese plus 0.5 cup sour cream
- 2 cup heavy cream
- ½ cup espresso or strong coffee
- 4 tablespoon dark rum, or 1 teaspoon rum extract
- ½ cup cocoa powder, for sprinkling
Instructions
- 1
Preheat oven to 350 degrees F.
- 2
Line a jelly roll pan with parchment paper.
- 3
Measure and sift the almond flour into a large bowl.
- 4
Add salt and baking powder to the almond flour and mix well.
- 5
In another large bowl, beat the softened butter with sugar substitute on high until light and fluffy.
- 6
Add room temperature cream cheese and vanilla extract, beat until well mixed.
- 7
Add eggs one at a time, combining well after each addition.
- 8
Add dry ingredients a tablespoon at a time, incorporating fully.
- 9
Spread batter into the prepared pan.
- 10
Bake for 25 to 30 minutes until golden brown on top.
- 11
Cool fully for about 30 minutes, then slice into 1 by 3 inch pieces.
- 12
Beat egg yolks with sugar substitute and salt until thick and lemon colored.
- 13
Place the egg mixture in a double boiler over gently boiling water.
- 14
Reduce heat to low simmer and cook the egg mixture for about 9 to 10 minutes, whisking constantly.
- 15
Remove from heat and add mascarpone cheese or the cream cheese and sour cream mixture.
- 16
In a medium bowl, beat heavy whipping cream until medium peaks form.
- 17
Gently fold the egg mixture into the whipped cream with a spatula.
- 18
Combine espresso and rum in a small bowl and set aside.
- 19
Sprinkle a layer of cocoa powder to the bottom of the pan using a strainer or sifter.
- 20
Place a layer of cake on top.
- 21
Using a pastry brush, coat the cake layer with the coffee and rum mixture.
- 22
Spread custard over the cake layer.
- 23
Add another layer of cake on top.
- 24
Repeat the layers of cake and custard, ending with custard.
- 25
Top with a generous coating of cocoa powder.
- 26
Cover and refrigerate for at least 8 hours or overnight before serving.
Tips
Sift almond flour before measuring to eliminate clumps that create dense spots. This extra step ensures an even, tender crumb that properly absorbs the coffee-rum mixture without becoming soggy.
Use a double boiler for the egg yolk custard and whisk constantly to pasteurize and thicken safely. Never skip the heat stage, as it develops flavor depth and ensures food safety with raw eggs.
Fold the custard into whipped cream gently with a spatula using a J-motion. Overmixing deflates the whipped cream and compromises the light, mousse-like texture that defines quality tiramisu.
Good to Know
Cover and refrigerate for up to 48 hours.
Prepare 1 day ahead. Flavors develop and meld overnight. Assemble completely, cover, and refrigerate until serving.
Serve chilled directly from the refrigerator. Cut with a warm, wet knife between layers for clean slices.
Common Mistakes
Do not overmix the batter after adding eggs to avoid a tough, dense cake structure.
Do not skip the double boiler step for the egg yolk custard to avoid scrambled eggs and ensure food safety.
Do not stir the whipped cream mixture vigorously to avoid deflating the cream and losing the mousse-like texture.
Substitutions
Dairy-Free Swaps
Gluten-Free Swaps
coconut flour requires liquid adjustment, not recommended
Full guide →General Alternatives
depends on sweetener type, sweetness varies
FAQ
Can I make this without the rum or alcohol?
Yes. Use 1 teaspoon rum extract mixed with the espresso, or omit flavoring entirely and increase espresso to 3/4 cup. The coffee flavor will dominate; the cake remains delicious without alcohol.
What if I don't have mascarpone cheese?
The recipe provides a substitute: mix 8 ounces cream cheese with 0.5 cup sour cream. This ratio mimics mascarpone's tanginess and richness. The custard will be slightly less luxurious but still excellent.
How long can I refrigerate tiramisu before serving?
Refrigerate at least 8 hours or overnight for best flavor development. Store leftovers up to 48 hours refrigerated. Avoid freezing, as the mousse texture becomes grainy when thawed.