Naked Berry Chiffon Cake

Ingredients

• Cake
• Unsalted butter, room temperature
• 2 3/4 cups cake flour (not self-rising)
• 1 3/4 cups plus 2 tablespoons granulated sugar, divided
• 2 3/4 teaspoons baking powder
• 1 teaspoon kosher salt
• 1/2 cup plus 2 tablespoons safflower oil
• 9 large egg yolks, plus 11 large egg whites, room temperature
• 1 cup whole milk
• 1 tablespoon grated lemon zest
• 1 vanilla bean, split and seeds scraped
• 1/2 teaspoon cream of tartar
• Whipped Cream
• 4 cups heavy cream
• 1/4 cup plus 2 tablespoons confectioners' sugar
• 2 pints fresh raspberries
• 2 pints fresh blueberries
• 2 pints fresh blackberries
• 1 pint fresh strawberries, halved or quartered
• Edible flowers, such as pansies
• Confectioners' sugar, for dusting