Combine the blackberries and vanilla sugar.
Heat the clarified butter in a non-stick frying pan. Fry the bread and nuts for approx. 5 mins. until golden brown, then mix in the blackberries.
Combine the cream, eggs and sugar, pour into the pan. Reduce the heat, use a spatula to keep moving the mixture and cook for approx. 5 mins. until the egg mixture solidifies. Dust with icing sugar.