Preheat the oven to 375°. Line a large, rimmed baking sheet with parchment paper. In a large bowl, mix the sugar, cornstarch, cinnamon, lemon zest, and salt. Place the apples on top. Set aside.
On a floured board, roll the dough to a 12- to 13-inch round. A little ragged is fine. Fold it into quarters, brushing off any excess flour. Unfold on the lined baking sheet.
Drizzle the apples with the honey and lemon juice and toss to mix well. Leaving a 2-inch border, arrange the apple slices on the dough in an overlapping circle. Place the remaining slices in the center. Evenly scrape any of the juices from the bowl over the apples and dot with butter. Fold over and pleat the dough edges around the filling, pressing firmly. Brush the edges with the egg yolk mixture, and sprinkle apples and crust with the spice topping.
Bake for 40 to 50 minutes, until the crust is golden brown and crisp and the apples are tender when pierced with a fork. If the crust is getting too brown while baking, loosely cover the galette with a sheet of foil.
Let cool on the baking sheet on a wire rack. Serve warm or cool.