Serve in glasses or mugs, a generous helping of wine and a few fruits.
Remarks
Many people think that the most important thing in mulled wine is the spices, but for me it's more the wine-fruit mix which gives the delicious hint of acidity. Then you can add whatever you want: vanilla, cinnamon, aniseed, pepper,...
For a quick mulled wine, forget: vanilla sugar, grapefruit and cinnamon.
For a glittering presentation, serve in glasses (not mugs) with the edges dipped in white egg then caster sugar.