The blinis have a light nutty flavor as they are made with buckwheat flour.
In a bowl, mix both types of flour.
Melt the butter in a small pan and set it aside.
Warm the milk until it is hand-warm, then dissolve the yeast and sugar in the lukewarm milk.
Add the melted butter and yeast mixture to the flour, stirring until smooth.
Separate one of the eggs and add the yolk of that egg along with the other whole egg to the dough, mixing well.
Beat the egg whites with a pinch of salt until stiff peaks form, then gently fold them into the batter.
Cover the bowl and let the mixture rise for 30 minutes.
On each blini, place a teaspoon of sour cream and a small amount of caviar.
Garnish each with half a quail egg and a sprig of dill.
If desired, add finely diced shallots on top.
Serve with a glass of champagne or iced vodka.