In a mixing bowl, combine the flour, sugar, and salt. Add the butter, egg, and white wine, then knead until you have a smooth dough. Wrap in plastic wrap and refrigerate for 30 minutes.
For the filling, combine the mascarpone cheese, powdered sugar, instant coffee, and brewed coffee. Mix thoroughly with a spatula, then refrigerate for at least 30 minutes to allow the cream to thicken.
On a lightly floured surface, roll out the rested dough thinly. Cut into 10x10 cm (approximately 4x4 inch) squares, then wrap each square around a metal cannoli form. Moisten the edges with water and press to seal, ensuring they don't open during frying.
Heat the oil to 350°F (180°C) in a deep pot or fryer. Fry 2-3 cannoli at a time until golden brown. Drain on paper towels, then remove from the molds once cooled.
Using a piping bag, fill the cooled cannoli with the coffee-flavored mascarpone cream. Fill both ends to distribute the cream evenly. Serve immediately after filling.
Dust with powdered sugar before serving. The bold coffee flavor and the creaminess of the mascarpone create a perfect pairing. No garnish is needed – the flavors speak for themselves.
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