Add a teaspoon of espresso powder to the chocolate cake batter to intensify the cocoa flavour with a coffee hit.
Add candied orange zest to the frosting or on top for chewy sweetness and citrus flavour.
Spread a thin layer of hazelnut spread between the cake layers for a creamy, nutty flavour that goes with orange and chocolate.
Add a teaspoon of orange blossom water to the cream frosting for extra orange oomph and a floral note.
Drizzle dark chocolate ganache over the top for extra indulgence and visual wow.
Brush the cake layers with a syrup made from orange juice and sugar to keep them moist.
Add a pinch of cinnamon or nutmeg to the batter for a warm, spicy hit that goes with chocolate and orange.