Activate the yeast: In lukewarm milk, stir in the sugar and yeast. Let it stand for 10 minutes, or until foamy.
In a large bowl, combine the flour and salt. Cut in the butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs.
Add the sour cream, egg, and activated yeast mixture. Mix well until a dough forms.
On a lightly floured surface, roll the dough out to about ¾ inch (2 cm) thickness. Fold the dough in thirds like a letter. Repeat this folding process two more times to create layers.
Cover the dough with a clean kitchen towel and let it rest for 30 minutes to rise slightly.
Roll the dough out again to about ¾ inch (2 cm) thickness. Using a round cookie cutter or a pogácsa cutter, cut out the scones.
Place the scones on a baking sheet lined with parchment paper. Brush the tops with beaten egg.
Sprinkle the tops of the scones generously with sesame seeds. Bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until golden brown.
Let them cool slightly before serving. They should be crispy on the outside and tender on the inside.
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