Fold in the apple, flour and cocoa powder with a metal ... Once combined, fold this into the remaining egg white mixture. Spoon the mixture gently into the cake tin and bake for 30 minutes ...

and the acidity interacts with the cocoa powder to enhance its red colour. This means an eggless version of the cake is minimally different, as the egg substitute is apple cider vinegar ...

Grease a 25cm/10in cake ... egg mixture has been incorporated and the mixture is well combined. In a separate bowl, mix together the flour, bicarbonate of soda, baking powder, salt, cinnamon and ...