whole (about 20cm/8-inch round) Vanilla cake • (about 150g), pitted and chopped Plums • Sugar (for compote) • Butter (for buttercream) • Sweetened condensed milk (for buttercream) • Cinnamon powder (for buttercream) • Nutmeg • Vanilla extract • Brown sugar (for buttercream) • Cinnamon sugar (for dusting, optional) • Fresh plums and mint or lemon balm(for garnish, optional)