To make the crepe batter, combine the flour, eggs, milk, sparkling water, and a pinch of salt in a bowl. Whisk until smooth.
Let the batter rest for 10-15 minutes. Then, heat a lightly oiled skillet over medium heat and cook 6-8 thin crepes.
For the fillings, mix the ground walnuts with 50 g of sugar. In a separate bowl, mix the cocoa powder with 30 g of sugar.
Start layering: place a crepe in a heatproof dish, spread with jam, then top with another crepe.
Sprinkle the next layer with the sugared walnuts, followed by another crepe.
Sprinkle the following layer with the cocoa-sugar mixture, and continue layering until all the crepes are used.
Spread the sour cream on the top layer, then bake in a preheated oven at 350°F (180°C) for 15 minutes.
Meanwhile, for the chocolate sauce, melt the dark chocolate with the milk and butter until smooth.
Pour the hot chocolate sauce over the baked crepes, then let it stand for a few minutes to allow the flavors to meld.
Slice and serve, garnished with powdered sugar or extra walnuts.
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