Gluhwein

Ingredients

1/2 medium orange
1/2 cup sugar
3/4 cup water
2 tbsp mulling spices
1 (750-milliliter) bottle dry red wine
Rum or amaretto

Directions

1. Zest orange peel. 
2. Combine the water and sugar in a large saucepan and boil until the sugar has dissolved. Reduce the heat and add mulling spices, orange zest, and orange juice. Simmer until a fragrant syrup forms, about 1 minute.
3. Reduce the heat further and add wine. Let simmer on low, 20 minutes up to a few hours.
4. Strain and serve in small mugs, adding a shot of rum or amaretto.