In a saucepan, combine the water, sugar, and cinnamon stick (I used 2 since they were half sticks). Bring to a boil, then reduce heat, and simmer.
Cut the orange into slices and push cloves into the orange and place in the simmering water. Continue simmering for 30 minutes, or until thick and syrupy.
Pour in the wine, and heat until steaming but not simmering (about 5-10 minutes). Taste the wine and add more sugar if needed. Remove the orange slices. Serve hot in mugs or glasses that have been preheated in warm water (cold glasses will break). Garnish with a fresh orange slice or one from the pot.
Feel free to double or triple the recipe depending on how many you are serving. In Germany they had crockpots filled in just about every store. This can easily be reheated in the microwave for about a minute. Just a warning, this will knock you on your butt a bit faster than regular wine, the heating process really strengthens the alcohol so consider yourself warned. Drink up!
Have you ever had mulled wine?