Activate the yeast: in lukewarm milk, mix in the sugar and yeast, then let it stand for 10 minutes until foamy.
In a large bowl, combine the flour, ground walnuts, and salt. Rub in the butter with your fingertips until the mixture resembles breadcrumbs.
Add the sour cream, egg, and activated yeast mixture, then knead the dough thoroughly until smooth.
On a lightly floured surface, roll out the dough to about 2 cm thickness. Fold the dough in thirds three times to create flaky layers.
Cover with a kitchen towel and let it rest for 30 minutes to rise.
Roll out the dough again to about 2 cm thickness, then use a scone cutter to cut out the shapes.
Place the scones on a baking sheet lined with parchment paper and brush the tops with beaten egg.
Sprinkle the tops of the scones with ground walnuts, then bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until golden brown.
Let them cool slightly, then serve fresh, crispy on the outside and tender on the inside.
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