Preheat your oven to 350°F (180°C) and line a cake pan with parchment paper.
In a large bowl, cream together the butter, sugar, and vanilla sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
Melt the dark chocolate over a double boiler, then stir it into the butter-egg mixture.
In a separate bowl, whisk together the flour, cocoa powder, baking powder, and a pinch of salt.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk, and mix until the batter is smooth.
Pour the batter into the prepared cake pan and bake for 35-40 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes, then invert it onto a wire rack and let it cool completely.
Heat the heavy cream until it just begins to simmer, then pour it over the chopped dark chocolate and stir until smooth to create the ganache.
Pour the chocolate ganache over the cooled cake and spread it evenly with a spatula.
Decorate with fresh raspberries, then refrigerate the cake for at least 1 hour before slicing and serving.
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