Separate the eggs. In a bowl, whisk the yolks with the sugar, vanilla sugar, and a pinch of salt until pale and creamy.
Gradually add the milk and flour, whisking continuously until you have a smooth batter.
In a separate bowl, whisk the egg whites until stiff peaks form. Gently fold the beaten egg whites into the batter, being careful not to deflate it, to create a light and airy mixture.
Heat a skillet over medium heat. Lightly grease it with butter. Pour a ladleful of batter into the hot skillet and cook on one side only until golden brown.
Slide the pancake onto a plate, cook the next pancake, and place it on top of the first, with the uncooked side facing up.
Sprinkle the pancakes with ground walnuts between each layer. Repeat the process until all the pancakes are used.
Leave the top layer plain. Before serving, drizzle generously with chocolate sauce.
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