Cut the apricots into strips and soak in water. Wash apples, peel, cut into eighths, cut out the core and cut the eighths into fine slices. Sprinkle with 2 tablespoons of lemon juice.
Roughly chop the almonds. Mix quark, milk, oil, 75 g sugar, salt and vanillin sugar with the whisks of the hand mixer. Mix flour and baking powder and stir half of it into the dough by the spoonful.
Knead in the remaining flour. Roll out to a square (35 cm x 35 cm) on a floured work surface. Drain the apricots and mix with apples, almonds, lemon peel and the remaining sugar.
Spread the filling on the dough so that one side remains 4-5 cm free. Separate the egg. Spread the free dough strip with egg white and roll up from the opposite side. Cut into slices of about 2.5 cm thick.
Place the snails on a baking tray lined with baking paper and bake in a preheated oven (electric range: 200 °C/ gas: level 3) for about 20 minutes until golden brown. Mix egg yolk and cream and brush the snails with it after about 15 minutes.
Mix icing sugar and remaining lemon juice to a smooth glaze. Remove the snails from the oven and brush them with icing while still warm. Let them cool down.