Add the cinnamon sticks, cloves, allspice berries, orange slices and brown sugar if using.
Cover and cook on low for 3 to 4 hours, until the cider is steaming hot and smells strongly of cinnamon and clove.
Strain out the whole spices and orange slices with a fine mesh sieve, or ladle carefully around them.
Keep on warm for serving, ladling into mugs with a fresh cinnamon stick in each.
Good to Know
This is the non-alcoholic option for the table; add a shot of spiced rum to individual mugs rather than the whole pot, so it stays safe for anyone not drinking.