In lukewarm milk, dissolve the sugar and crumble in the yeast. Let it stand for 10 minutes, until foamy.
In a large bowl, sift the flour, add the salt and freshly ground black pepper, then crumble in the cold butter.
Pour in the proofed yeast, sour cream, mustard, and the whole egg. Knead the dough until it is elastic.
Mix the grated cheese into the dough, then cover and let rise in a warm place for about 1 hour.
On a floured surface, roll out the dough to about 2 cm thick, then fold it over to create airiness.
Roll out again to 2 cm thick, then use a scone cutter to cut out the scones. Place them on a baking sheet lined with parchment paper.
Brush the tops with beaten egg, then sprinkle with a little freshly ground black pepper. Bake in a preheated oven at 350°F (180°C) until golden brown, about 20-25 minutes.
Let the scones cool on a wire rack, then serve fresh or store in an airtight container.
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