In a large bowl, combine the flour, sugar, and a pinch of salt. Add the butter, egg, and white wine, then knead until a smooth dough forms. Cover and let it rest in the refrigerator for 30 minutes for easier handling.
For the filling, combine the pistachio cream, mascarpone cheese, powdered sugar, and vanilla extract in a bowl. Mix with a spatula until smooth and creamy. Refrigerate for at least 30 minutes for easy filling.
On a lightly floured surface, roll out the rested dough thinly. Cut into approximately 10x10 cm (4x4 inch) squares, then wrap them around metal cannoli forms. Seal the edges with a dab of water to prevent them from opening during frying.
Heat the oil to 350°F (180°C) in a deep pot. Fry 2-3 cannoli at a time until golden brown. Drain on paper towels, and when cooled, carefully remove from the forms.
Fill the cannoli with the pistachio cream using a piping bag. Fill from both ends to ensure even distribution. Fill just before serving to maintain freshness and crispness.
Dust with powdered sugar before serving. The pistachio filling is rich and flavorful, so no additional garnish is necessary. Consume immediately to prevent the shells from losing their crispness.
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