In lukewarm milk, stir in the sugar. Crumble in the fresh yeast and let it stand for 10 minutes until foamy.
Sift the flour into a large bowl, add the salt, and create a well in the center.
Pour the yeast mixture into the well, mix with a wooden spoon, and begin kneading the dough.
Once the dough comes together, transfer it to a lightly floured surface and knead for 10 minutes until smooth and elastic.
Place the dough in a bowl, cover with a kitchen towel, and let it rise for 1 hour, or until doubled in size.
Roll out the risen dough into a rectangle. Place the cold, flattened butter in the center, and fold the dough over the butter, encasing it completely.
Gently roll out the dough, then fold it into thirds (like a letter). Cover and refrigerate for 30 minutes.
Repeat the folding and rolling process two more times, refrigerating the dough for 30 minutes between each turn.
Roll out the prepared puff pastry to about 5 mm (approximately 1/4 inch) thick. Cut into triangles and roll them up to form croissant shapes.
Place the croissants on a baking sheet lined with parchment paper, cover with a kitchen towel, and let them proof for 30 minutes.
Whisk the egg and brush the tops of the croissants with it for a beautiful shine.
Bake in a preheated oven at 375°F (190°C) for 15-18 minutes, or until golden brown.
Let the croissants cool slightly, then serve fresh with butter or jam.
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