In a medium bowl, combine the mascarpone cheese, powdered sugar, and instant coffee. Finely grate or chop the dark chocolate and add it to the cream mixture. Mix well and refrigerate for 10 minutes to firm up slightly.
On a lightly floured surface, roll out the puff pastry to a thickness of approximately 2 mm. Cut into 10x10 cm (approx. 4x4 inch) squares. If the pastry becomes too warm, return it to the refrigerator for a short period.
Place a teaspoon of the tiramisu cream in the center of each pastry square. Ensure that the filling does not reach the edges, or it may leak during baking. Tip: Avoid overfilling!
Fold the pastry in half diagonally to form a triangle. Press the edges firmly with a fork to seal, ensuring the samosa remains closed during baking.
Whisk the egg and brush it over the top of the samosas. This will give them a beautiful sheen and golden-brown color. For an egg-free option, use plant-based milk instead.
Preheat the oven to 350°F (180°C) and place the samosas on a baking sheet lined with parchment paper. Bake for 18–20 minutes, or until golden brown and crispy. Watch closely towards the end to prevent the pastry from burning.
After baking, let cool for 10 minutes, then lightly dust the tops with cocoa powder. Serve warm – the filling will be even more luscious!
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