1. Superfine sugar is finer granule regular sugar: You can purchase it superfine or you can simply pulse regular granulated sugar in your food processor for a minute. Superfine sugar lends to a finer crumb and tender cake. That said, you can also use regular sugar--the cake will still be wonderful!
2. Red Velvet Bakery Emulsion: This product from Lorann Oils adds a gorgeous deep red hue and subtle citrus flavour that make this cake unique and tasty. But don't worry if you can't get your hands on any--this cake recipe is still dynamite the old-fashioned way: add 1 tablespoon pure vanilla extract plus 3 tablespoons red liquid food colouring in place of the emulsion.