Star-Shaped Blueberry Shortcakes

Ingredients

• 2 cup unbleached all-purpose flour
• 1/4 cup sugar, plus 1 teaspoon for sprinkling
• 1 tablespoon baking powder
• 1/4 teaspoon salt
• grated zest of 1 lemon
• 4 tablespoon cold unsalted butter, cut into 1/2-inch cubes
• 1 cup heavy cream, plus 2 teaspoons for brushing
• 1 cup fresh blueberries