Set the pot over medium-high heat and bring to a boil, stirring often until the sugar has dissolved.
Reduce the heat to low and simmer for 5 minutes.
Remove from heat and allow to cool for 30 minutes.
Remove the rosemary and cinnamon stick. Strain the syrup through a fine-mesh sieve or cheesecloth, and discard the cranberries. Transfer the syrup to a glass jar.
Notes
Storage: Store in an airtight container in the refrigerator for up to 1 month.Usage: To make a sparkling cranberry mocktail, mix 1 oz (2 tablespoons) Cranberry Rosemary Shrub with 6 oz ( 3/4 cup) sparkling water or soda over ice. For an extra festive touch, I like to serve them over cranberry ice cubes and garnish with a sprig of rosemary. Using 1 oz per serving this recipe yields enough syrup for 10 servings.