Warm the milk until lukewarm, then stir in the sugar and yeast. Let it stand for 10 minutes until foamy.
In a large bowl, sift the flour and add the salt. Pour in the yeast mixture and the egg. Start kneading the dough.
Knead the dough until smooth. Cover with a clean kitchen towel and let rise in a warm place for about 1 hour, or until doubled in size.
Roll out the risen dough into a rectangular shape. Place thin slices of cold butter (200g) all over the dough. Fold one half of the dough over the other, then roll it out again and fold it into thirds. Repeat this folding process three times, resting the dough for 15 minutes between each fold.
Mix the tomato sauce with oregano and a pinch of salt. Dice the pepperoni or salami into small pieces.
Cut the mozzarella into small cubes or shred it, to make a easily melted filling.
After the final roll-out, cut the dough into triangles. Place a small amount of tomato sauce, mozzarella, and pepperoni in the center of each triangle. Roll up the triangles 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 beaten egg, then bake for 18-20 minutes, or until golden brown.
Once the croissants are baked, let them cool slightly before serving fresh.
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