Preheat the oven with electrical heat at 175 degrees Celsius.
Grate the chocolate in thin slices in a bowl.
Use one tablespoon of the margarine to butter a baking form on the bottom and the edges.
Pour the bread crumbles in the baking form and turn the form so the crumbles cover the bottom and the edges.
Pour the margarine in a casserole and melt it slowly on medium heat. Take away the casserole from the stow and pour the saffron in the margarine.
Stir the eggs and the sugar fluffy with an electrical mixer.
Pour the flour in the sugar and egg mixture and stir gently together.
Pour the melted margarine and the chocolate in the batter and stir together.
Pour the batter in the baking form and place the cake in the middle of the oven for fifteen minutes.
Take out the cake from the oven and let it cool down in room temperature.
Whip the whip cream together with the vanilla sugar.
Serve the cake together with some whip cream to enhance the taste.