Preheat your oven to 350°F (180°C). Grease and line a baking sheet with parchment paper.
In a large bowl, whisk together the all-purpose flour, almond flour, and 100g of the granulated sugar.
In a separate bowl, whisk the eggs with the remaining sugar until light and fluffy. Gradually whisk in the flour mixture.
Melt the butter and gently fold it into the batter.
Pour the batter onto the prepared baking sheet and bake for 10-12 minutes, or until a toothpick inserted into the center comes out clean. Let cool completely.
Make the ganache: bring the heavy cream to a simmer, then pour it over the dark chocolate. Stir until smooth and glossy.
Combine the espresso and simple syrup, then brush the cake layers with the mixture to keep them moist.
Assemble the cake: layer the cake layers with a thin layer of ganache between each layer.
Spread a thin layer of chocolate ganache over the top of the cake, then dust with cocoa powder.
Refrigerate the cake for at least one hour to set before slicing and serving.
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