How to Make It:
Prepare the Syrup:
In a saucepan, combine the milk and sugar, stirring over medium heat until the sugar dissolves. Allow the mixture to come to a gentle boil and simmer for about 15 minutes. Remove from heat, stir in the vanilla, and set aside to cool completely.
Assemble the Kadayıf Layers:
Spread the fresh kadayıf in a wide tray and drizzle the melted butter over it. Using your hands, gently work the butter into the strands until they are evenly coated and moist throughout.
Layer the Dessert:
Press half of the buttered kadayıf into a 24 x 35 cm (9 x 13 inch) baking dish, forming a compact, even layer. Sprinkle the chopped walnuts over this layer, then cover with the remaining kadayıf. Use a cutting board or a flat, sturdy object to press down firmly, ensuring the layers are well-compressed.
Bake:
Preheat your oven to 180°C (350°F), conventional setting (no fan). Bake for about 50 minutes or until the top turns golden and crisp.
Soak and Chill:
Remove from the oven and let it rest until the initial heat subsides. Pour half of the cooled milk syrup over the warm kadayıf, allowing it to absorb. Slice the dessert into portions, then pour the remaining syrup evenly over the top. Transfer to the refrigerator and let it chill thoroughly, at least a couple of hours, so the syrup can fully infuse the pastry layers.
Garnish and Serve:
Once chilled, sprinkle the grated chocolate over the top. Add a shower of finely chopped pistachios if desired. Serve the dessert cold, savoring its delicate interplay of textures and flavors.