Cappuccino Chiffon Cake

Ingredients

• 2 1⁄4 cups all-purpose flour
• 1 1⁄2 cups caster (superfine) sugar
• 1 tablespoon baking powder
• 3⁄4 teaspoon cinnamon
• 1⁄2 cup walnut oil or extra-light olive oil
• 2 large eggs, separated, plus 4 large egg whites
• 3⁄4 cup brewed espresso coffeeat room temperature
• 2 tablespoons cocoa powder
• 1 teaspoon vanilla extract
• 1⁄2 teaspoon cream of tartar
• 2 tablespoons icing sugar, sifted, to dust