In a large bowl, combine the flour, sugar, and salt. Add the butter, egg, and white wine. Knead until you have a smooth, elastic dough. Wrap in plastic wrap and refrigerate for at least 30 minutes to make it easier to handle.
For the filling, heat the heavy cream in a small saucepan. Remove from the heat and add the finely chopped dark chocolate. Stir until smooth and the chocolate is completely melted. Stir in the vanilla extract and powdered sugar. Let cool, then refrigerate for at least 30 minutes, until thick and creamy.
On a lightly floured surface, roll out the dough very thinly. Cut into 10x10 cm (approximately 4x4 inch) squares. Wrap the squares around metal cannoli forms, sealing the edges with a dab of water to prevent them from opening during frying.
Heat the oil to approximately 350°F (180°C). Fry each cannoli until golden brown. Drain on paper towels. Once cooled, carefully remove the forms.
Using a piping bag, fill the cooled cannoli shells with the dark chocolate cream. Fill both ends to distribute the cream evenly inside. Serve immediately or refrigerate until serving.
Dust with a light coating of powdered sugar before serving. The filling is rich and flavorful, so no extra garnish is needed. Fill the shells just before serving to keep the shells crispy.
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