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Place wine, spices, orange slices, vanilla, sugar and bay leaf in a pan over medium heat and cook until hot and sugar has dissolved.
Strain wine, reserving orange slices and discarding remaining solids, into a heatproof jug and divide among glasses. Add an orange slice to each glass and serve with biscuits.
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Strain wine, reserving orange slices and discarding remaining solids, into a heatproof jug and divide among glasses. Add an orange slice to each glass and serve with biscuits.