1hr 20min · 10 servings 1¾ cups cake flour (210g) 1¼ cups granulated sugar (250g) 1 tablespoon baking powder ¾ teaspoon salt 7 large egg yolks room temperature ¾ cup cold water 180mL ½ cup vegetable oil (120mL) 2 teaspoons vanilla extract 7 large eggs whites room temperature ½ teaspoon cream of tartar