For the curd cheese soufflé, cut the bread into small slices and soak in a little milk. Mix the curd, juice of one lemon, yolks, sugar, rum and raisins to a smooth cream. Whip the egg whites to stiff peaks and fold into the curd cream with the flour.
Grease a gratin dish, squeeze out the bread slices and spread one part on the bottom of the gratin dish. Put half of the curd mixture on top, then put another layer of the buns on top, the second half of the curd mixture and finally put another layer of the buns on top. Spread a few knobs of butter evenly on top and bake at 200 °C for 60-70 minutes.
Sprinkle with powdered sugar and serve with milk.