Step 1: In a large bowl, whisk together the flour, salt, and granulated sugar. Cut in the cold butter until the mixture resembles coarse crumbs. Add ice water one tablespoon at a time until the dough just comes together.
Step 2: Form the dough into a disk, wrap in plastic, and refrigerate for at least 1 hour.
Step 3: Preheat your oven to 400°F (200°C). In a medium bowl, toss the sliced apples with lemon juice, brown sugar, cinnamon, and nutmeg.
Step 4: On a floured piece of parchment paper, roll out the dough into a 12-inch circle. It doesn't need to be perfect!
Step 5: Mound the apple mixture in the center of the dough, leaving a 2-inch border. Sprinkle the chopped pecans over the apples.
Step 6: Fold the edges of the dough over the fruit, pleating as you go. Brush the edges with egg wash and sprinkle with turbinado sugar.
Step 7: Transfer the parchment to a baking sheet and bake for 40-45 minutes until the crust is golden brown and the apples are tender.
Step 8: Let the galette cool for 15 minutes before slicing and serving.