Place eggs and butter on a plate. Place sugar, salt and dry yeast in containers. Pour flour into a bowl. Place sour cream and milk in different glasses.
In a bowl, mix yeast, sugar and a tablespoon of flour. Pour in warm milk, stir and leave for 15 minutes. Beat the eggs into a bowl with the dough and add salt. Add flour to the dough slowly. Mix everything and leave the dough for 2 hours in a warm place, then form small buns. Place the buns on a parchment-lined baking sheet and place in the oven. Bake the buns at 200°C until golden brown.
Mix sour cream with sugar. Place the finished buns in a dish and dip them in sour cream. Leave the buns for 4 hours to soak.
Place the buns on a plate and decorate them with berries.