Fill wine with sugar, grated lemon and orange peel and spices in a pot and bring it to a boil.
Let it stand for 1-2 days then strain it.
Fill the mulled wine into clean bottles (rinsed with boiling hot water) and close them right away.
Keep them up to 4 weeks at a cool and dark place. If you have a wine cellar, that’s the ideal place.
If you want to drink it just re-heat the wine but don’t let it boil.