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.
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