Set your slow cooker on to it its "low" setting.
Pour all of the cider into the slow cooker pot.
Add the orange cut in half, star anise, cinnamon sticks, tea bags and stir.
Place the lid onto the the slow cooker and leave for three hours, stirring occasionally.
Strain the cider through a sieve to remove any unwanted bits (or scoop them out).
Stir in the brandy or rum.
Ladle into heat proof glasses or mugs (or leave to stay warm in the slow cooker).
Add one cinnamon stick, a large slice of orange, and two star anise to each glass.