Warm the milk until lukewarm, then stir in the sugar and yeast. Let it stand for 10 minutes, or until frothy.
Sift the flour into a large bowl, add the salt, then pour in the yeast mixture and the egg. Start kneading the dough.
Knead the dough until smooth, then cover it with a clean kitchen towel and let it rise in a warm place for about 1 hour.
Roll out the risen dough into a rectangle. Place thin slices of cold butter (200g) over two-thirds of the dough. Fold one side of the dough over the butter, then fold the other side on top. Roll out the dough again and fold it into thirds. Repeat this folding process three times, resting the dough in the refrigerator for 15 minutes between each fold.
After the final roll, cut the dough into triangles. Place a small spoonful of strawberry jam and a few slices of fresh strawberries in the center of each triangle, then roll them up into croissant shapes.
Place the croissants on a baking sheet lined with parchment paper and let them rise for another 30 minutes.
Preheat the oven to 350°F (180°C). Brush the croissants with a little beaten egg, then bake them for 18-20 minutes, or until golden brown.
Once the croissants are baked, let them cool slightly, then dust them with powdered sugar and garnish with fresh strawberry pieces.
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