01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, toss the sliced pears with lemon juice, brown sugar, cinnamon, nutmeg, ginger, and salt. Set aside to macerate for 10 minutes.
03 - Unroll the puff pastry on a lightly floured surface. Cut into 6 equal rectangles or circles. Arrange them on the prepared baking sheet.
04 - Brush the pastry edges with beaten egg to promote golden browning.
05 - Drain excess liquid from the pears and arrange the slices neatly on the pastry, leaving a 1/2-inch border.
06 - Brush pears with melted butter. Sprinkle with sliced almonds, if using.
07 - Bake for 22 to 25 minutes, or until the pastry is golden and crisp.
08 - Let cool slightly, then dust with powdered sugar if desired. Serve warm or at room temperature.