Once you've tried the classic double chocolate, try these flavour spins on this simple recipe to find your favourite flavour:
Add the zest of 3 oranges to the bowl in step 2. Replace the dark chocolate in the frosting to a good quality dark orange chocolate. Decorate with orange zest.
Replace the cocoa powder paste mix with 50ml lemon juice and add the zest of two lemons to the bowl in step 2. Reduce the baking powder to ½ tsp. Replace the chocolate frosting with lemon buttercream made with 190g softened butter mixed with 380g icing sugar and 1 tbsp lemon juice. Decorate with lemon zest.
Replace the cocoa powder paste mix with 50ml strong coffee (made with 1tbsp instant coffee granules mixed with 50ml boiling water, cooled). Reduce the baking powder to ½ tsp. Dust with cocoa powder to decorate.