Ahead of time, strain sour cream (at least 21%) through a sieve lined with cheesecloth and refrigerate for at least 4-6 hours so the whey drains off.
Draw 18 cm circles on parchment with a pencil - two fit on a baking sheet. The parchment must be very good quality.
Put the eggs with a pinch of salt and vanillin in a bowl and beat with a mixer for a couple of minutes. Add the can of condensed milk and beat again.
Pour in the melted and cooled butter, beat, then add the sifted flour with the baking powder in two additions and beat again - the batter is ready.
For each layer, spread 2 tbsp of batter, smoothing it into a circle with a spoon, and bake for 10-12 minutes at 180 C, until golden on top. Immediately flip the layer onto a wire rack and peel off the parchment. This makes 9 layers total.
For the frosting, beat the strained sour cream with the powdered sugar, add the well-chilled cream and beat until thick and stable.
Assemble the cake in a ring lined with parchment. Spread a little frosting on the serving plate, place a layer, spread 2 tbsp of frosting, add the next layer, more frosting and strawberry pieces - repeat this way to the end.
Top with the last layer, leaving it plain, place a light weight on top and refrigerate for at least 4 hours, ideally overnight.
Smooth the cake with the remaining frosting, melt the milk chocolate with the butter over a double boiler and create a drip effect, then top with berries. Enjoy!