soak the blackberries in a bit of brandy for about half an hour. whip the egg whites with the sugar (half a cup) until its steady. whip the yolks with the vanilla sugar until its doubled (size) and bright. add the cheese and whip until its smooth. add the cornflour and mix until smooth. add the blackberries (after straining them) and mix together. incorporate the egg whites foam with the cheese mixture until light and smooth. pour the mixture into a baking tin (pattern) and place in a preheated oven (160 C) for an hour.