Roll out the dough into a square and place the butter plate (without the baking paper) in the centre of the dough. Fold the corners of the dough around the butter plate to form an envelope.
First round: Carefully flatten the dough with a rolling pin* and roll out until you have an elongated rectangle. Fold in a third of the dough on the left-hand side and fold the right-hand third over it so that there are three equal layers of dough on top of each other.
Wrap the dough in a tea towel and place in the fridge for 30 minutes.
Then unwrap the dough again, carefully flatten with a rolling pin* and roll out into a long rectangle. For the second round, fold the rectangle in again to create three layers of dough.
Perform a total of three rounds. Place the dough in the fridge for 30 minutes between batches.
For the filling, mix the cottage cheese with the sugar, vanilla sugar and egg yolk and set aside.
After the third round, the dough is rolled out into a large rectangle.
Cut the rectangle into twelve equal rectangles using a pizza cutter*. For cheese Danish pastry pockets: Spread the cottage cheese filling on the rectangles, fold over the corners and press together in the centre.
Place the Danish pastry pockets on a baking tray, brush with milk, water or egg, cover and leave to rest for two to three hours - depending on the room temperature.
For Danish pastries with rhubarb: Fold the corners of the rectangles towards the centre. Place the pastries on a baking tray, brush with milk, water or egg, cover and leave to rest for two to three hours.
Press the centre in slightly, spread the cottage cheese filling on top and place the rhubarb pieces on the cottage cheese.
Brush the cheese Danish pastries with milk or egg again before baking.
Preheat the oven to 230 degrees using a steam tray consisting of a stainless steel oven dish* and lava stones*. Bake the Danish pastries for 10 minutes with steam and about 20 minutes or until they are golden brown.