Rustic Apple Galette: A Taste of Autumn's Simplicity

Ingredients

• 1 1/4 cups (150g) all-purpose flour, plus more for dusting
• 1/2 teaspoon (2.5ml) granulated sugar
• 1/4 teaspoon (1.2ml) salt
• 1/2 cup (113g) unsalted butter, very cold and cut into small cubes
• 1/4 cup (60ml) ice water
• 4 medium apples (such as Honeycrisp, Granny Smith, or Gala), peeled, cored, and thinly sliced
• 2 tablespoons (28g) unsalted butter, melted
• 2 tablespoons (30ml) granulated sugar
• 1 tablespoon (15ml) lemon juice
• 1 teaspoon (5ml) ground cinnamon
• 1/4 teaspoon (1.2ml) ground nutmeg
• Pinch of salt
• 1 large egg, beaten (optional)
• 1 tablespoon (15ml) milk or water (optional)
• 1 tablespoon (15ml) coarse sugar (such as turbinado or sanding sugar, optional)