Strawberry Galette with Whipped Cream

Ingredients

• Dough
• 1¾ cups all-purpose flour, plus more for rolling out dough
• 1½ tablespoons minced fresh rosemary
• 1 tablespoon granulated sugar
• ½ teaspoon kosher salt
• ¾ cup (1½ sticks) cold unsalted butter, cubed
• 3 tablespoons ice water
• Filling and Assembly
• 4 cups quartered strawberries
• 3 tablespoons white sugar
• 1 tablespoon cornstarch
• 1 tablespoon balsamic vinegar
• 1 large egg, beaten with 1 tablespoon water
• Demerara sugar, for topping (optional)
• Whipped Cream
• 1 cup heavy cream
• ⅓ cup sour cream
• ¼ cup confectioners’ sugar
• 2 teaspoons pure vanilla extract