Chop the pistachios. Melt the chocolate over a double boiler, then let it cool.
Cream together the butter and granulated sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition.
Sift together the flour, baking powder, and cocoa powder. Gradually add the dry ingredients to the egg mixture, then stir in the melted chocolate.
Fold half of the chopped pistachios into the batter. Pour the batter into a greased and floured cake pan.
Bake in a preheated oven at 350°F (180°C) for about 35-40 minutes, or until a toothpick inserted into the center comes out clean.
While the cake is cooling, prepare the frosting: whip the heavy cream with the powdered sugar until stiff peaks form. Fold in the remaining chopped pistachios.
Once the cake is completely cool, frost it with the pistachio whipped cream. Garnish with extra pistachios or chocolate shavings.
Refrigerate the cake for at least an hour before serving, to allow the frosting to set and the flavors to meld.
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