Step 1: Prepare the pastry

• In a food processor, combine the flour, sugar, and salt. Add the cold butter and pulse until the mixture resembles coarse crumbs.
• Gradually add the ice water, 1 tablespoon at a time, pulsing until the dough just comes together.
• Form the dough into a disk, wrap it in plastic wrap, and refrigerate for at least 30 minutes.

Step 2: Preheat the oven

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

Step 3: Prepare the filling

• In a mixing bowl, toss the sliced pears with sugar, lemon juice, vanilla extract, cinnamon, and flour. Ensure the pears are evenly coated.

Step 4: Roll out the pastry

• On a lightly floured surface, roll out the chilled pastry into a 12-inch circle. Transfer it to the prepared baking sheet.

Step 5: Assemble the galette

• Arrange the pear slices in the center of the pastry, leaving a 2-inch border. Fold the edges of the pastry over the filling, pleating as needed to form a rustic shape.

Step 6: Add the glaze

• Brush the pastry edges with the beaten egg yolk and sprinkle with coarse sugar.

Step 7: Bake the galette

• Bake for 40–45 minutes, or until the crust is golden brown and the pears are tender.

Step 8: Cool and serve

• Let the galette cool slightly before serving. Serve warm or at room temperature with a scoop of vanilla ice cream or a dollop of whipped cream.