Preheat the oven at 175 degrees Celsius.
Melt the butter in a casserole.
Take away the casserole from the heat. Let it cool down 5 minutes.
Add the sugar and the eggs one by one while stirring.
Add the cardamon powder, flour, almond flour and vanilla sugar. Mix well.
Grate the almond paste and pour it in the batter and stir.
Pour the batter in the form and place in the middle of the oven for 15 minutes.
Take out the mud cake and let it cool down.
Before serving the cake sprinkle icing sugar evenly on the cake.