½ cup (113 grams) mascarpone cheese*, room temperature2 tablespoons (24 grams) granulated sugar1 teaspoon (1 gram) lemon zestRough Puff Pastry Dough (recipe follows)Blueberry Filling (recipe follows)1 large egg (50 grams)1 tablespoon (15 grams) water½ cup (60 grams) confectioners’ sugar2 teaspoons (10 grams) fresh lemon juice
Preheat oven to 400°F (200°C). Line 2 baking sheets with parchment paper.
In a medium bowl, whisk together mascarpone, granulated sugar, and lemon zest until smooth and well combined.
On lightly floured surface, roll Rough Puff Pastry Dough into a 16×12-inch rectangle. Cut 12 (4-inch) squares from dough; halve each square diagonally to make 2 triangles. Spread 2 teaspoons(8 grams) mascarpone mixture onto center of half of triangles; top each with2 tablespoons (12 grams) Blueberry Filling. Place on prepared pans.
In a small bowl, whisk together egg and 1 tablespoon (15 grams) water. Using a pastry brush, brush edges of filled triangles with egg wash. Top with remaining triangles, and crimp with a fork to seal. Freeze until firm, about 15 minutes.
Using a small knife, cut 3 small vents in top of each pastry. Brush pastries with egg wash.
Bake for 10 minutes. Reduce oven temperature to 375°F (190°C), and bake until golden brown, about 15 minutes more. Let cool on pans for 10 minutes. Remove from pans, and let cool completely on a wire rack.
In a small bowl, whisk together confectioners’ sugar and lemon juice; drizzle onto cooled pastries. Serve immediately.
*We used BelGioioso Mascarpone Cheese.