In a small pot, add together the water, cinnamon sticks, and sugar. Bring to a boil over medium-high heat, and simmer, uncovered, for 10 minutes, stirring occasionally.
Remove from heat, and let cool in the pot, until it’s cool enough to easily remove the cinnamon sticks.
Pour the cinnamon syrup into a clean glass jar, and place in the refrigerator until cold.
Stored in the refrigerator, it should keep for up to 1 month.
Make Moscow mules:
Fill a copper mug with ice.
Add vodka, orange juice, ginger beer, and cinnamon simple syrup.
Give the drink a quick stir, garnish with an orange wedge and a cinnamon stick, if desired. Serve cold.
Notes
There will be more cinnamon syrup than you need for this drink. Use leftovers in more Moscow Mules, in your morning coffee, over ice cream, on cake, or anywhere you want a hint of spice.