In the food processor, add the flour, salt and granulated sugar. Pulse a few times until mixed. Then drop in the butter cubes. Pulse again until the butter is incorporated.
1½ cups all purpose flour, 1 tbsp granulated sugar, ½ tsp salt, 12 tbsp cold butter
Add the ice cold water one tablespoon at a time, pulsing thoroughly in between. Once the dough forms into a ball, stop adding water.
4-6 tbsp ice cold water
Turn the dough out onto a surface and form it into a flat oval with your hands. Then wrap it in plastic wrap and place it in the fridge to chill for at least 30 minutes, or up to 48 hours.
Prepare the blueberry mixture. In a bowl, add the blueberries, lemon juice, granulated sugar and cornstarch. Mix with a spoon and set aside.
2½ cups fresh blueberries, ¼ cup granulated sugar, juice from half a lemon, 1 tbsp corn starch
Preheat the oven to 375℉. Sprinkle a surface with flour to prevent sticking and unwrap your dough. With a rolling pin, roll the dough out into a large circle, until it's about twelve inches wide in diameter (does not need to be a perfect circle).
Place the blueberry mixture in the center of the dough, and spread it out into an even layer. Leave about a 3-inch border of crust around the filling (it's likely going to be uneven, which is fine).
Lift the edges of the dough and start to fold it in so that it's just touching the start of the blueberry filling. Fold all the way around the circle.
Scramble the egg in a small bowl for egg wash. Brush the egg wash on the dough. Then sprinkle additional granulated sugar where you applied the egg wash.
1 egg, granulated sugar
Bake the galette in the oven for 35-40 minutes, until the crust is a deep golden brown. Let cool for five minutes and eat! Serve with ice cream.
vanilla ice cream