Warm 2L dry cider in a saucepan and add 6 cloves, 4 cinnamon sticks, 3 star anise, a pinch of freshly grated nutmeg and the juice and zest of one orange. Bring it almost to a boil, reduce heat and simmer, about 30 minutes. Serve in mugs or heatproof glasses with a slice of fresh apple for garnish.