Cake with chocolate and caramel

ingredients:
250 g dark chocolate.
100 g of powdered sugar.
100 g of butter.
6 eggs.
10 g of flour.
caramel.
nuts.
method:

 Melt chocolate with butter .
Pour the melted chocolate into a bowl and add the sugar, whisking. Separate egg whites from yolks, and raising the whites.
Add the egg yolks to chocolate and stir well. Add the flour and mix, then the egg whites. Pour into a buttered and floured pan, and bake for 35 minutes.
Heat the caramel over low heat, and pour it over the cake. Garnish with nuts and serve.