Preheat oven to 375°F. Position the oven rack in the bottom third of the oven. Line a pizza pan or rimmed half-sheet pan with a silicone liner or parchment paper.
On a lightly floured surface, roll the dough into a 13 to 14-inch circle; trim to produce a neat 13-inch circle. Transfer the dough to the prepared pizza pan or baking sheet. (See Tip 7)
Add the apples and lemon juice to a large bowl; toss to combine. Add the brown sugar, cornstarch, cinnamon, nutmeg, ginger, salt, and vanilla extract; toss to combine.
Sprinkle the half tablespoon of flour on the prepared pastry, leaving a 2-inch border around the edge. Spread toasted pecans on the pastry. (See Tip 8)
Using a slotted spoon, remove the apples from the bowl, leaving excess liquid in the bowl. Arrange the apple slices in concentric circles, leaving the 2-inch border around the edge. Sprinkle one tablespoon of the apple juices over the apples.
Carefully fold the edges of the pastry 2 inches over the apples, pleating the dough as necessary. Gently press to seal the edges. If desired, brush the pastry edges with egg wash and sprinkle the crust with the turbinado sugar.
Bake in the preheated 375°F oven for 1 hour or until the crust is golden brown and the apples are tender.
Remove the apple galette from the oven and carefully transfer it (still on the silicone liner or parchment paper) to a wire rack to cool for 10 minutes.
While the galette cools, heat a tablespoon of apricot jam and 1 teaspoon of water in a microwave-safe bowl in the microwave for 15 to 20 seconds or until bubbling. Brush over the apples. (See Tip 9)
Carefully slide the apple galette onto the wire rack to remove it from the silicone liner. Allow to cool until warm, about 30 minutes. Cut into wedges; if desired, serve with vanilla ice cream.
Yield: 8 servings. (See Tip 10)