Mix the egg yolks, quark, starch, powdered sugar, vanilla sugar and Citro-Back together. Beat the egg whites until stiff and let the sugar trickle in. First pull the egg whites, then 2/3 of the currants into the curd mixture.
Put everything in a greased baking dish (28 cm diameter) and sprinkle the remaining berries on top. Bake in the oven at 200 °, fan-assisted 170 °, gas: level 3, for approx. 45 minutes.