Strawberry Rhubarb Galettes

Ingredients

• 2 cups all-purpose flour
• 1 tablespoon granulated sugar
• 1 teaspoon salt
• 12 tablespoons unsalted butter (frozen for 20 minutes)
• 5-7 tablespoons ice water
• 2 cups diced strawberries (fresh or frozen, not thawed)
• 2 cups diced rhubarb (fresh or frozen, not thawed)
• ½ cup packed light brown sugar
• 2 tablespoons granulated sugar
• 1 tablespoon lemon juice
• 2 tablespoons corn starch
• 1 large egg yolk
• 1 teaspoon water
• ¼ cup turbinado or demerara sugar