Step 1

Place the cider in the pot over medium heat. Bring to a boil. Reduce heat to a simmer. Cook, stirring every now and then (at least twice per hour), until the cider has reduced down to about 2 cups (it should be about ⅛ of the volume that it initially was), which will take anywhere from 3-5 hours (mine took 3 hours). The cider will have the consistency of hot runny honey and will thicken as it cools.

Step 2

Remove the cinnamon sticks and pour the syrup through a strainer to remove any impurities and transfer to a container with an airtight lid, such as a pint-sized Mason jar. Place the lid on the jar and chill the syrup. Store in the refrigerator for up to 3 months.