In lukewarm milk, dissolve the sugar, then crumble in the yeast. Let it stand for 10 minutes, until foamy.
Soak the raisins in lukewarm water or milk for 10 minutes to soften them.
In a large bowl, sift the flour, add the salt, then rub in the cold butter until it resembles breadcrumbs.
Pour in the foamy yeast mixture, the sour cream, and the whole egg. Knead the dough until it is elastic.
Mix the ground walnuts and drained raisins 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 (¾ inch) thickness, then fold it over several times to create layers.
Roll out again to 2 cm (¾ inch) 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 ground walnuts. 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.
To provide the best experiences, we and our partners use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us and our partners to process personal data such as browsing behavior or unique IDs on this site and show (non-) personalized ads. Not consenting or withdrawing consent, may adversely affect certain features and functions.
Click below to consent to the above or make granular choices. Your choices will be applied to this site only. You can change your settings at any time, including withdrawing your consent, by using the toggles on the Cookie Policy, or by clicking on the manage consent button at the bottom of the screen.