Preheat your oven to 350°F (180°C). Prepare a cake pan by lining it with parchment paper or greasing and flouring it.
Melt the dark chocolate and butter in a double boiler or in the microwave. Let it cool slightly.
In a bowl, whisk the eggs and sugar until light and fluffy. Add the vanilla extract and finely chopped fresh mint.
Sift together the flour and cocoa powder. Gently fold the dry ingredients into the egg mixture. Add the melted chocolate and butter, and stir until smooth.
Pour the batter into the prepared cake pan and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
While the cake is baking, prepare the mint whipped cream: whip the heavy cream until stiff peaks form. Fold in the finely chopped mint.
Let the cake cool completely. Frost the top and sides with the mint whipped cream and garnish with fresh mint leaves or grated chocolate.
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