In lukewarm milk, stir in the sugar, then crumble in the yeast. Let it sit for 10 minutes until foamy.
In a skillet, toast the onion until golden brown, then let it cool completely.
In a large bowl, sift in the flour, add the salt, then crumble in the cold butter.
Pour in the foamy yeast mixture, sour cream, and whole egg. Knead the dough until it becomes elastic.
Incorporate the toasted onion and ground walnuts into the dough, then cover and let it rise in a warm place for about 1 hour.
On a floured surface, roll out the dough to about 2 cm thickness, then fold it over itself several times to create layers.
Roll out again to 2 cm thickness, 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 sesame seeds. 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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