Gently warm wine in a big pot on low or medium heat (avoid boiling), add sugar, juice of a fresh orange and a lemon.  Scrape the peel of the orange and the lemon with the sugar cubes.  Put the cloves in a tea strainer -so you can remove more easily later - and put it into the pot.  Add orange and lemon peel and the cinnamon stick.  Bring to a boil and then reduce the heat.  Stir occasionally to make sure that the sugar dissolves completely.  Let the mulled wine simmer for a few minutes, then remove the cloves and cinnamon.  Pour the wine in a nice cup and decorate it using your creativity (for example with orange or lemon slices and cinnamon sticks).