Peel and chop the onion. Wash the dill, shake dry and chop finely. Mix onion, 1 tablespoon dill, vinegar, 2 tablespoons water, mustard, salt, pepper and a little sugar. Fold in the oil. Cut the beetroot into slices, mix with the sauce and add at least a little bit of salt.
Leave to steep for an hour.
Warm 120 ml of milk lukewarm. Crumble the yeast and dissolve in it with ½ tsp. sugar. Mix with whole flour until smooth. Cover and leave to rise in a warm place for 20-30 minutes.
Melt 1 tablespoon of butter. Mix 1 tablespoon (approx. 30 g) sour cream and 75 ml milk. Whisk the egg. Stir everything with ½ TL salt into the yeast dough, cover and let it rise for about 30 minutes.
Heat the rest of the butter in portions in a large coated pan (approx. 28 cm Ø). Bake 3 pancakes (Bliny) one after the other from the dough. Let them cool down.
Spread Bliny with the rest of sour cream. Spread caviar and the rest of dill on top. Season with pepper. Roll up Bliny and cut into about 6 pieces. Garnish. Add beetroot. Drink: iced vodka.