Raspberry Ginger Stone Fruit Galette

Bahan-bahan (8 porsi)

• 1 1/2 cups flour
• 1/2 teaspoon kosher salt
• 8 tablespoons unsalted butter, cold + cut into 1/2 inch cubes
• 3 -6 tablespoons cold buttermilk or water
• 3 cups sliced stone fruit
• 1/4 cup brown sugar
• 1 inch fresh knob fresh ginger, grated
• 1 tablespoon bourbon ((optional))
• 1 tablespoon cornstarch
• juice from 1/2 a lemon
• 1 1/2 cups fresh raspberries
• 1 egg
• coarse sugar for sprinkling