Melt the chocolate with the butter over a bain-marie and mix together.
Separate the eggs.
Beat the egg whites with a pinch of salt until stiff.
Beat the egg yolks with the sugar, cardamom and cinnamon until creamy.
Slowly mix the melted chocolate-butter mixture and ground hazelnuts with the egg yolk to form a batter.
Fold the stiff egg whites into the batter.
Pour the batter into the springform pan and bake in the preheated oven for approx. 25 minutes.
Leave the baked chocolate tart to cool on a cooling rack.
Pistachio cream cheese
Mix the cream cheese with the rose water, icing sugar and ground pistachios to a cream.You can grind the pistachios yourself with a blender if you can't find ground pistachios in the supermarket.
Spread the cream over the tart and garnish with fruit and a little icing sugar if desired.
Cut chocolate tart into about 12 pieces and serve.