Preheat the oven to 350°F (180°C). Line a cake pan with parchment paper, or grease and flour it.
Melt the dark chocolate and butter in a heatproof bowl set over a pan of simmering water (or in the microwave). Let it cool slightly.
In a bowl, whisk the eggs and sugar until light and fluffy. Gradually add the melted chocolate mixture.
Combine the flour and baking powder. Gradually fold the dry ingredients into the chocolate mixture until just combined.
Pour the batter into the prepared cake pan and bake for 25-30 minutes, or until a toothpick inserted into the center comes out with moist crumbs. Let cool completely.
Whip the heavy cream until stiff peaks form. Add a little powdered sugar to taste.
Spread the whipped cream over the cooled cake. Garnish with fresh black currants and dust with powdered sugar.
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