The perfect make-ahead cocktail for a cold day, with the added bonus of making your house smell amazing. Add the alcohol at the very end to preserve its potency.
Special equipment: cheesecloth
Pour the apple cider into a slow cooker. Tie the ginger, cinnamon sticks, cloves, allspice and black peppercorns into a cheesecloth to make a sachet. Add the sachet, brown sugar and orange slices to the slow cooker. Set the slow cooker on high for 1 hour then reduce to low and continue cooking for another 4 hours. Add the gin just before serving. Serve in mugs.