📖 Instructions

1. **Start the Dough (The Easy Part!):** In a large mixing bowl, combine the all-purpose flour, granulated sugar, and salt. Give it a good whisk to make sure everything's evenly mixed. It’s important to distribute these dry bits so your dough has a consistent flavor.
2. **Cut in the Butter (Keep it Cold!):** Add the very cold, unsalted butter cubes to the flour mixture. Using a pastry blender, two knives, or even your fingertips (work quickly to keep the butter cold!), cut the butter into the flour until the mixture resembles coarse crumbs with some pea-sized pieces of butter still visible. Those little butter chunks are key to a flaky crust, so don't overmix here!
3. **Add the Water (Slowly Does It):** Gradually add the ice water, one tablespoon at a time, mixing gently with a fork or your hands until the dough just comes together. You might not need all the water, or you might need a tiny bit more – it depends on your flour and humidity. The dough should be shaggy but able to form a ball when squeezed; avoid making it too wet or sticky. Overworking the dough develops too much gluten, which can make your crust tough.
4. **Chill the Dough (Patience, Young Grasshopper):** Gently gather the dough into a ball, flatten it into a disc, wrap it tightly in plastic wrap, and refrigerate for at least 30 minutes. This chilling time is crucial! It allows the gluten to relax, making the dough easier to roll, and keeps the butter cold, which helps with flakiness.
5. **Preheat Your Oven & Prep Baking Sheet:** While the dough chills, preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper. This prevents sticking and makes cleanup a breeze.
6. **Make the Blueberry Filling:** In a separate medium bowl, combine the fresh blueberries, granulated sugar, lemon zest, lemon juice, and cornstarch. Toss gently until the blueberries are evenly coated. The cornstarch helps thicken the juices as the galette bakes, preventing a watery filling.
7. **Roll Out the Dough (Embrace the Imperfections!):** On a lightly floured surface, roll out the chilled dough into a rough 12-inch circle, about 1/8 to 1/4 inch thick. Don't stress about making a perfect circle; remember, this is a rustic galette! If it tears, simply press it back together. Transfer the rolled-out dough to your prepared baking sheet.
8. **Assemble Your Galette:** Pour the blueberry mixture into the center of the dough, leaving a 2-inch border all around the edges. Distribute the blueberries evenly.
9. **Fold the Edges (The Signature Look):** Gently fold the dough edges up and over the blueberries, pleating as you go to form a rustic border. Don't worry if it's not perfectly even or symmetrical – that's the charm of a galette!
10. **Egg Wash & Sugar Sprinkle (For that Golden Glow):** In a small bowl, whisk together the egg and a tablespoon of water to create an egg wash. Brush the egg wash gently over the folded dough edges. Then, sprinkle the turbinado sugar (or regular granulated sugar) over the egg-washed crust. This gives it a beautiful golden sheen and a lovely crunchy texture.
11. **Bake Until Golden:** Bake for 35-45 minutes, or until the crust is deeply golden brown and the blueberry filling is bubbly and thick. Keep an eye on it – ovens can vary! If the crust is browning too quickly, you can loosely tent it with foil.
12. **Cool and Serve:** Carefully remove the galette from the oven and let it cool on the baking sheet for at least 15-20 minutes before slicing. This allows the filling to set properly. Serve warm, perhaps with a scoop of vanilla ice cream or a dollop of whipped cream. Enjoy your homemade masterpiece!