Activate the yeast: In lukewarm milk, mix in the sugar and yeast, then let it stand for 10 minutes until foamy.
In a large bowl, combine the flour and salt. Crumble in the butter, distributing it evenly throughout the flour.
Add the kefir, egg, and activated yeast mixture to the bowl. Knead the dough thoroughly until it comes together.
On a lightly floured surface, roll out the dough to about 2 cm (¾ inch) thickness. Fold the dough in thirds three times to create flaky layers.
Cover with a kitchen towel and let it rest for 30 minutes to allow the dough to rise slightly.
Roll out the dough again to about 2 cm (¾ inch) thickness, then use a round cookie cutter to cut out the scones.
Place the scones on a baking sheet lined with parchment paper and brush the tops with beaten egg.
Bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until golden brown.
Let them cool slightly before serving fresh, with a soft and crumbly texture.
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