Slice all the apples with the skin on, thin, but you should not be able to see through them. They will burn if they are too thin.
3 cups Granny Smith apples
In a large mixing bowl, stir together the apple slices, brown sugar, lemon, vanilla, cornstarch, cinnamon, and ginger until fully coated.
2/3 cup light brown sugar: Packed, 2 tablespoons lemon juice , 2 teaspoons vanilla extract, 1 1/2 tablespoons cornstarch , 1/2 teaspoon ground cinnamon , 1/8 teaspoon ground ginger , 1/8 teaspoon ground nutmeg
Preheat the oven to 375℉ and line a large sheet pan with parchment, then set aside.
Place the dough in the center of a clean, lightly floured work surface. Use a rolling pin, starting in the center of the disk and rolling outwards.
Turn the dough and continue rolling towards the edges. Each time you roll, you should be turning to avoid sticking to the counter. If the dough sticks, sprinkle a little flour on top or bottom as you work.
Continue rolling and turning until the dough is about 11 1/2 – 12 inches in diameter and about 1/8-inch thick. It will be thin. But it should not be paper-thin.
Make sure to feel the top of the dough to ensure it’s the same thickness across the entire thing.
Gently transfer the pie dough to the sheet pan, being careful not to pull or tear the dough. (I folded the dough over the rolling pin and moved it easily).
Spoon the apple filling onto the center of the pie pastry OR place in a decorative spiral pattern (pictured), leaving about two inches around the edge.
Fold the pastry over the apples, overlapping the dough as needed.
Brush the pastry with the egg wash and generously sprinkle with the cane sugar.
1 large egg yolk + 1 tablespoon milk , 2 tablespoons organic cane sugar
Bake for 35-40 minutes, until the galette crust is golden brown. Make sure you watch the apples on top for signs of burning.
Remove from the oven and allow to cool to room temperature on a baking rack until set.