Melt the dark chocolate and butter together over a double boiler. Let it cool to room temperature.
Separate the eggs. In a bowl, whisk the egg yolks with the granulated sugar until pale and fluffy. Add the orange zest and freshly squeezed orange juice.
Sift together the cocoa powder, flour, and baking powder. Add this to the egg yolk mixture, then stir in the melted chocolate.
In a separate bowl, whip the egg whites until stiff peaks form. Gently fold the whipped egg whites into the chocolate mixture, ensuring the batter remains light and airy.
Pour the batter into a greased and floured cake pan. Bake in a preheated oven at 350°F (180°C) for 35-40 minutes, or until a toothpick inserted into the center comes out clean.
While the cake is cooling, whip the heavy cream with the powdered sugar until stiff peaks form. This will be used for decorating and filling.
Once the cake has cooled, slice it in half horizontally. Spread the orange-infused whipped cream filling over the bottom layer. Top with the remaining whipped cream and dust with cocoa powder.
Garnish with fresh orange slices or grated orange zest for an extra touch of elegance.
Refrigerate the cake for at least 2 hours to allow the flavors to meld and the cream to set.
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