In a bowl, combine flour, sugar, and salt. Add butter, egg, and white wine. Knead until you have a smooth, medium-soft dough. Wrap in plastic wrap and refrigerate for 30 minutes.
For the cream, combine mascarpone, powdered sugar, freshly brewed espresso, and instant espresso powder in a bowl. Mix with a spatula until smooth. Refrigerate for 30 minutes to allow the cream to thicken and set.
On a lightly floured surface, roll out the dough thinly. Cut into 10x10 cm (4x4 inch) squares. Wrap each square around a metal cannoli form, moisten the edges with water, and press to seal.
Heat vegetable oil to 350°F (180°C). Fry 2-3 cannoli at a time until golden brown. Place on paper towels to drain. Once cooled, carefully slide them off the forms.
Fill the cooled shells with the espresso mascarpone cream using a piping bag. Fill both ends to ensure even distribution of the filling. Fill just before serving to keep the pastry crisp.
Dust with powdered sugar before serving. The bold, deep flavor of espresso pairs perfectly with the silky mascarpone. Simple, unfussy presentation is recommended to let the cream shine.
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