2sheetfrozen puff pastry, thawedkeep cold for best puff
2cupfresh blueberries
0.5cupgranulated sugar
2tbspcornstarchthickens the filling
1tbsplemon zestfrom about 1 lemon
2tbsplemon juice
1tspvanilla extract
0.25tspkosher salt
1largeeggbeaten with 1 tbsp water for egg wash
1tbspwaterfor egg wash
1tbspcoarse sugarfor sprinkling
0.5cuppowdered sugaroptional glaze
1tbsplemon juicefor optional glaze
Instructions
Preparation Steps
Preheat oven to 400°F. Line 2 baking sheets with parchment paper.
In a bowl, gently toss blueberries, granulated sugar, cornstarch, lemon zest, lemon juice, vanilla, and salt until evenly coated. Let stand 5 minutes to become juicy.
Unfold puff pastry sheets on a lightly floured surface. Roll each sheet to smooth creases and cut into 4 equal squares (8 squares total).
Brush the edges of each square lightly with egg wash. Spoon about 0.25 cup blueberry filling into the center of each square.
Fold each square into a triangle, pressing edges to seal. Crimp edges with a fork. Cut a small slit on top for steam to vent.
Arrange on prepared sheets, brush tops with remaining egg wash, and sprinkle with coarse sugar.
Bake 18 to 22 minutes, until puffed and deep golden. Cool 10 minutes on the pan.
For the glaze, whisk powdered sugar with lemon juice until smooth and drizzle over warm turnovers, if desired. Serve warm or at room temperature.
Notes
Keep the pastry cold for maximum flakiness. If it softens while assembling, chill the filled turnovers for 10 minutes before baking.