Preheat oven to 400°F (200°C). Line a baking sheet with parchment.

Roll pastry into a 10x10-inch square. Cut into 4 equal squares.

Toss apple and pear slices with lemon, brown sugar, and cinnamon.

Brush pastry edges with melted butter. Pile fruit in center of each square, leaving a border.

Fold edges slightly over fruit and brush with egg wash.

Bake 15–18 minutes until golden and puffed. Cool 5 minutes before serving. Dust with powdered sugar if using.