In a medium saucepan over low heat, combine all of the ingredients and whisk well to incorporate.
Cook the syrup for 10-15 minutes until reduced by half, whisking frequently to prevent burning.
Once reduced, remove syrup from heat and strain to remove cinnamon and cloves.
In a copper mug, combine 2-3 tablespoons prepared syrup, whiskey, and ginger beer, stirring well.
Add ice, and garnish with a blood orange slice.