Honey Dough:
100 g (about 7 tablespoons) butter
1 cup sugar
2 eggs
2 tablespoons honey
1.5 teaspoons baking soda
Flour
Poppy Seed Dough:
3 eggs
250 g (about 1 1/4 cups) sugar
250 ml (about 1 cup) sour cream (a thicker, tangier version of sour cream common in Eastern European cuisine)
1 teaspoon ammonia (or baking ammonia)
350 g (about 2 cups) ground poppy seeds
250 g (about 2 cups) flour
Frosting:
500 g (about 1 1/4 cups) condensed milk
400 g (about 1 3/4 cups) butter
Beat the eggs with the sugar, then add the softened butter, honey, and baking soda dissolved in vinegar. Melt this mixture over a water bath, cool it down, and add enough flour to knead a soft dough. Bake 6 layers (honey dough).
Beat the eggs with the sugar, then add the sour cream, ammonia, ground poppy seeds, and flour. Bake 1 layer (poppy seed dough).
Beat the butter with the condensed milk (frosting).
Assemble: layer three honey layers with frosting, then add the poppy seed layer, more frosting, and top with three more honey layers, also frosted.