In lukewarm milk, dissolve the sugar, then crumble in the yeast. Let it stand for 10 minutes, or until foamy.
In a large bowl, sift the flour, add the salt and ground coriander, then cut in the cold butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs.
Add the proofed yeast mixture, sour cream, and whole egg. Knead the dough until it is smooth and elastic.
Finely chop the fresh coriander and mix it into the dough along with the grated cheese. Cover and let rise in a warm place for about 1 hour.
On a lightly floured surface, roll out the dough to about 2 cm (¾ inch) thickness, then fold it over itself to create layers.
Roll out again to 2 cm (¾ inch) thickness, then use a round cookie cutter to cut out the scones. Place them on a baking sheet lined with parchment paper.
Brush the tops with beaten egg and 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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