Place all of the ingredients into a saucepan and simmer gently for 6-8 minutes, without boiling. Alternatively, place the ingredients in your slow cooker and cook on low until warm (1-2 hours, depending on your slow cooker).
To serve, pour the mulled wine into heatproof glasses.
If you're having a party this Christmas, try making mulled wine in the slow-cooker. Add all the ingredients to the slow cooker, switch it on, and it will keep at the perfect temperature all night.
