Preheat the oven to 160°C. Grease 1X 23cm round cake pans and line base and sides with baking paper.
Sift flour, cinnamon and nutmeg into a large bowl. Beat butter and sugar in a stand mixer fitted with paddle attachment until thick and pale. Add eggs, 1 at a time, beating well after each addition. Add vanilla, reduce speed to low and add flour mixture, buttermilk, a pinch of salt flakes and the grated apple.