Making a Rustic Honeycrisp Apple Galette is simple when you follow these steps:

1. Make the Dough: In a large bowl, mix the flour, salt, and granulated sugar. Add the chilled butter and mix until the mixture resembles coarse crumbs.
2. Add Water: Gradually add ice water, one tablespoon at a time, mixing until the dough comes together. Do not overmix.
3. Chill the Dough: Form the dough into a disc, wrap it in plastic wrap, and refrigerate for 30 minutes.
4. Prepare the Filling: In a separate bowl, combine the sliced Honeycrisp apples, brown sugar, cinnamon, and lemon juice. Toss until the apples are well coated.
5. Preheat the Oven: Preheat your oven to 400°F (200°C).
6. Roll Out the Dough: On a floured surface, roll the chilled dough into a 12-inch circle. Transfer it to a parchment-lined baking sheet.
7. Arrange the Apples: Place the apple mixture in the center of the dough, leaving a 2-inch border. Arrange the apples in a circular pattern for a beautiful presentation.
8. Fold the Edges: Gently fold the edges of the dough over the apples, pleating it as you go to create a rustic look.
9. Brush with Egg Wash: Brush the crust with the beaten egg and sprinkle additional sugar over the top for a sweet finish.
10. Bake: Place the galette in the oven and bake for 35-40 minutes, or until the crust is golden brown and the apples are tender.
11. Cool: Let the galette cool for 10 minutes before serving. This resting time allows the flavors to meld beautifully.

Following these steps will lead you to a successful Rustic Honeycrisp Apple Galette that is sure to impress!