Activate the yeast: in lukewarm beer, stir in the sugar and yeast, then let it stand for 10 minutes until foamy.
In a large bowl, combine the flour and salt, then rub in the butter until it resembles breadcrumbs.
Add the sour cream, egg, and the activated yeast mixture, then knead the dough thoroughly until smooth.
On a lightly floured surface, roll the dough out to about Ÿ inch (2 cm) thickness, then fold it in thirds three times to create layers.
Cover with a kitchen towel and let rest for 30 minutes to allow the dough to rise slightly.
Roll out the dough again to about Ÿ inch (2 cm) 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.
Sprinkle the tops with grated cheese, then bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until golden brown.
Let cool slightly, then serve fresh, with a crispy exterior and a tender interior.
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