This Lemon Lavender Cake is a buttery, rich cake using a butter cake ratio of a Victoria Sandwich sponge, featuring a triple dose of lemon: a buttery, lemon-scented cake, a generous, tangy lemon glaze, and a bright lemon icing. The lavender adds an ethereal lift and an enchanting aroma. (It's basically a dolled-up lemon-drizzle cake.)