For baked blackberries separate the egg. Whip egg whites with sugar, beat flour with wine, vanilla sugar, lemon zest, yolks and salt until well blended, fold in beaten egg whites.
Heat oil about 3 fingers high, briefly wash blackberries, pat dry and sprinkle into the batter. Using a spoon, lift the blackberries out of the batter and place in the hot oil.
Bake until golden brown, lift out and drain on paper towels.
Sprinkle with powdered sugar.