Heat the milk to 35-37°C (95-99°F). Add 0.5 tablespoon of sugar to the milk.
Add salt.
Add the dry yeast and 1 tablespoon of sifted flour. Let sit in a warm place for 15-20 minutes.
Separate the egg whites from the yolks. In a bowl, combine the remaining sugar and sour cream with the yolks. Mix well with a whisk.
Add the yolk mixture to the dough.
Melt the butter and creamy margarine on medium heat. Add them to the dough along with the vegetable oil.
In a separate bowl, whisk the egg whites.
Add the whipped egg whites to the dough and mix gently.
Rinse and dry the raisins, then roll them in flour. Add to the dough.
Gradually add the remaining sifted flour and knead the dough.
Using floured hands, knead the dough thoroughly for 10-20 minutes until it's soft and pliable. Add a little vegetable oil if needed to prevent sticking.
Cover the dough and let it rise in a warm place for 2 hours.
Divide the dough into 3 parts. Shape 2 parts into long rolls.
Twist the 2 rolls together and connect the ends to form a ring.
Shape the third part into a long roll and place it around the bottom of the ring. Let rise for 15-20 minutes.
Brush the roll with egg yolk and sprinkle with poppy seeds.
Bake in a preheated oven at 190°C (374°F) for 30 minutes.
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