Put the flour in a bowl and make a well in the middle. Mix the yeast with some of the sugar and the lukewarm water. Pour into the well and stir a little into the flour. Now add the remaining sugar, salt, butter, sour cream and egg yolk and knead into a dough. You may need some more water, it should be a smooth dough that you knead briefly and then put in a lightly floured bowl. Cover and let rise in a warm place for 60-90 minutes, it should have doubled in volume.
When this is done, you make the filling by mixing the cream cheese with the butter, sugar, salt, vanilla extract, flour and egg.
Mix the jam with the flour in another bowl.
Then divide the dough into two equal parts. Put one back in the bowl and cover it. The other one flows out to a rectangle of 26 × 39 cm. Now put half of the jam in the middle. Stroke them lengthways in a strip about 10cm wide. Now spread half of the cream cheese filling onto this strip of jam. At the bottom and at the top, fold the dough inwards about 2 cm. Go to the long side of the dough and cut it into 2cm wide strips. But do not cut all the way to the filling, leave about 1.5 cm there. You do the same on the other side and then you put the strips alternately over the filling (you can find a photo in my album under Recipe Pictures *** My Recipes *** Part 3).
Then you put the dough with the help of a cake lifter on a baking sheet that has been lined with baking paper. Cover the dough with a damp cloth and let it rise for another hour or so, or until its volume has increased significantly.
In the meantime, preheat the oven to 180 degrees.
Then you whisk the egg white with the water and brush the dough with it. Sprinkle it with granulated sugar and bake it for 30-35 minutes. It should be golden brown in color. Remove and allow to cool completely on a wire rack. Do exactly the same with the other half of the dough.
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