Put 500g flour in a mixing bowl and make a well in the center. Add the fresh yeast cube and 2 tablespoons of sugar to the well. Pour 150ml of lukewarm milk (approximately 37°C / 98°F) over it, then cover lightly with some flour. Let rest in a warm place (around 25-27°C / 77-81°F) for 10-15 minutes.
While the dough rests, peel the apples, remove the cores, and grate the flesh. Transfer the grated apples to a saucepan.
Add cinnamon and sugar to taste to the apples, then cook over medium heat for 10 minutes, stirring occasionally, until softened. Remove from heat, let cool to room temperature, then stir in the chopped walnuts. Set aside.
After the initial 10-15 minute rest, add 2 eggs, 1 pinch of salt, and 80g of soft butter to the dough. Knead until well combined and smooth, then let rise in a warm place for 30 minutes.
After the second rise, divide the dough into roughly equal portions and shape each into a ball. Using a rolling pin, roll each ball out into an oval shape.
Using a pizza cutter or knife, make a single cut down the middle on one side of the oval (do not cut all the way through). Place the cooled apple filling on the other side of the oval, fold the dough over, and press the sides firmly together to seal.
Brush the turnovers with egg yolk. Bake in a preheated oven at 180°C / 356°F using top and bottom heat for 20 minutes until golden brown. Remove from the oven and sprinkle generously with powdered sugar while still warm.
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