We infused Mulling Spice in apple cider, making it spicy and aromatic. All the sweetness comes from the apples so there is no added sugar or syrup and the bouquet of spices really comes through.
This cocktail is a perfect one to make ahead of time as a "batch cocktail" during the holidays--the whiskey will blend nicely into the mulled apple cider, and the flavors will mellow and get smoother as it sits.