To prepare the Pastors Wassail Liquor recipe, you first need to gather your ingredients. You will need: 2 oz. bourbon, 1 pound of rye whiskey, 3 tbsp. of allspice, 1/2 cup molasses, and 1 cup of water. Bring the ingredients to a boil over medium heat. Once the mixture begins to boil, reduce the heat to medium-low and simmer until the whiskey is reduced by half, about 15 minutes. Remove the saucepan from heat and add the remaining ingredients, except for the rum. Allow the alcohol to cool to room temperature. Then, pour the liquor into jars and store them in an airtight container until you are ready to use them.